MiSTer updates and changelog

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Vectrex:
- Overlays support (Alan Steremberg)
- Autoload for overlays.
- Fixes for overlays.
- Update the framework.
Note: update Main to latest!

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Atari 2600:
- Fix PitFall II mapper.
- TIA: priority/score fix (Bobby is Going Home).

[steddyman]

Amstrad PCW

Release 2 now available with the following changes:
- Support for PCW9512+ Mode and 3.5" drives
- Support for two disk drives
- SDRAM support to provide upto 2MB memory
- Colour mode with configurable starting point
- CPC paging mode. Fixes issues with various games (e.g. Abadia, Head over Heels)
- Mouse movement improvements
- Daisywheel port emulation to allow PCW915+ CPM to boot
- Fixed issues with disk corruption and boot errors
- Fixed corruption issue with RAMtest
- F2/F4/F6/F8 no longer require you to press shift

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ao486:
- sound: Implement Sound Blaster 16
- sound: Upgrade 8bit sound to Sound Blaster Pro
- sound: support alternative configs for IRQ (5,7,10) and DMA (no-HDMA mode)
- pic: rework and fix IRQ 7 and 15.
- dma: refactoring to implement all channels.
Read the updated readme!

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ZX Spectrum:
- Some updates in ULA

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ao486:
- Fix floppy compatibility with win9x driver and other fixes and tweaks.
- Support for B: drive.
- cpu: prefetch clear on code modify detection (Robert Peip).
Note: you have to update boot0.rom (BIOS) and Main to latest for full floppy fix.


Main:
- ao486: support for secondary floppy.
- menu: use LEFT button to return from sub-menu.

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SNES:
- Do not autosave during rom loading to prevent save erase (paulb-nl)
- Add DSP1A ROM (Rouven Spreckels)
- Autoselect DSP1A version for Pilotwings (you have to update Main!)
- CX4: Allow CPU to access BSRAM for Megaman X3 mods (steven-a-wilson)
- CX4: revert clock adjustment to prevent X2 menu slowdowns (in attract mode: player will die)
Note: you have to update the Main!

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Atari 2600:
- Port Gyurco's audio and video fixes.
- VBlank regeneration option to fix various games (paulb-nl)
- Pause button (attn: it turns off VGA video when paused!)

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Menu:
- Fix Linux framebuffer 8bit color mode.

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Linux:
- Update to latest bbond007's Midilink version
- Update BT pairing scripts (c0d3h4x0r)
- HID quirks for RetroUSB devices (paulb-nl)
- Add Switch driver (DarkShortie)
- Fix against crash of Switch driver on uncalibrated controller
- Disable motion events from Switch controller

[Pierco]

Epoch Galaxy II & TomyTronic Scramble:
- New cores added.

[macro]

Arcade Astrocade:
- Sound Fixes to Master Oscillator preset, Tremolo, Mux and Adder - Reggs
- Memory changes (see Read.me)
- update framework

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Main:
- ao486: ao486: rework IDE, support for CD-ROM.

ao486:
- Complete rework of IDE, move main logic to HPS.
- Support up to 4 HDD of up to 137GB each.
- Support for CD-ROM (data-only for now).
- Fix the timers (fix the speaker music in SCUMM games).
- Other internal improvements.
Note1: Read the updated ReadMe for HDD and CD-ROM info!
Note2: You have to update Main to latest one!

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TurboGrafx-16/CD:
- Option to simulate composite colors (Kitrinx).
- Additional filters for PSG and ADPCM (Kitrinx).
- Some other fixes.

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ao486, Main:
- Support for CUE CD format.
- Implement more CD commands.
- Fixes and tweaks in CD.
- Option to choose CD hot-swap drive.
- Sound: add delay for IRQ (fix 3D lemmings and some other games)
- Joystick: add None type.
Note: you must update Main to latest one!

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NeoGeo:
- Fix sprite layer shift (Furrtek)
- Some other fixes.

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Main:
- TGFX16: CD fixes (srg320)

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SNES:
- Fix CX4: Megaman X2 doesn't die in attract mode (srg320).

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BBC Micro:
- port audio fixes (squidrpi)
- update the Framework.

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Main:
- file_io: browser: ignore case when locating in catalog if case sensitive name not found.
- ao486: mount CD images as read-only.
- ao486: locate currently selected file from config.
- ao486: support for image mounting from core.

ao486:
- add imgset utility (mount FDD/HDD/CD image from command line)
note: You must update Main to latest!

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Atari 2600:
- Second fire button.
- Adaptive aspect ratio and de-comb (Kitrinx)

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C64:
- Tweaks in PRG injector code (Stat-Mat).
- Update the framework.

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SNES, Main:
- Support for BSX mapper (srg320).
Note: you must update Main as well!

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Minimig:
- Support for RTG (port by Grabulosaure).
- Update TG68K to latest.
- Some additional tweaks and improvements.
- Update the framework.
Note: Read the readme for RTG setup.

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SNES:
- Simple option to play SPC files. Audio only, without interface (srg320)
- Add special LoRom mapping for Derby Stallion 96 and Sound Novel Tsukuru (srg320)
Note: you must update Main to latest release!


Main:
- SNES: updates from srg320 (SPC playback, mapper tweaks)
- TGFX16: SGX mode for CD games (homebrew).

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Atari 2600:
- Stereo mode
- Add B/W, P1/P2 difficulty switches to gamepad.

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Minimig:
- RTG: ignore aspect ratio (always use square pixels)
- Support for custom aspect ratio.
Note: you must update Main as well!

Main:
- Support for custom aspect ratio from INI (cores require update!)
- Adjust autofire increments.

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ao486, Atari ST, Archie:
- Support for custom aspect ratio.
Note: you must update Main to latest!

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NES:
- Add mapper 413 (Gray Rogue)
- Fix reset stack pointer decrement (Gray Rogue)
- Add mappers 91 and 189 (paulb-nl)
- Adjust palettes (paulb-nl)
- Support for custom aspect ratio.
Note: you must update Main to latest!

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Specialist/MX:
- Fix RKS loading
- Support for custom aspect ratio.
- Update the framework