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[Core/MD] fixed MegaSD edge case when another 'pause' command is sent while fade out is still in progress

[Core/MD] fixed MegaSD edge case occurring when 'play' command is sent while previous track fade out is still in progress

[Core/MD] added support for MegaSD CD hardware overlay (MD+ hacks) and extended SSF2 / ROM write mappers

[Libretro] Rework "Hide Master System Left Border" option

Reworked the option so that now you can hide either 8 pixels on both left and right sides of the screen, or the 8 pixels on the left side only.
Also added a check that makes sure it doesn't cut whenever VDP register $00 bit 5 isn't set, which prevents the option from cutting when it's not necessary (e.g. the title screen of Gangster Town, the half pipe stage of California Games, the Phantasy Star menu screen).

[libretro] removed genesis_plus_gx_libretro.so from repository (accidentally added in https://github.com/ekeeke/Genesis-Plus-GX/commit/e389f577c9fb3efa542527b5ed1875eb207187f8)

This properly addresses the loading issue in Retroarch with compressed files reported by https://github.com/libretro/Genesis-Plus-GX/pull/249

This reverts commit cc8a6725.

[Core/MS] Add Power Strike II to internal database as 50Hz game

[Core/Sound] improved MAME YM2413 core EG attack phase algorithm accuracy (verified on YM2413 real hardware, cf. https://www.smspower.org/Development/YM2413ReverseEngineeringNotes2017-01-26) and EG increment table consistency

[Core/Sound] fixed MAME YM2612 core potential issue with SSG-EG inverted attenuation level on Key OFF

[Core/Sound] improved MAME YM2413 EG transitions accuracy (verified against https://github.com/nukeykt/Nuked-OPLL/blob/master/opll.c)

[Core/Sound] fixed MAME YM2413 core EG updates being 2x faster after EG resolution change and improved EG increment steps accuracy (verified on YM2413 real hardware, cf. https://www.smspower.org/Development/YM2413ReverseEngineeringNotes2015-03-20)

[libretro] Add New Devices