in_vgm v0.50.1
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* completely rewritten using libvgm, featuring:
    + Nuked OPL3 sound core
    * some bugfixes to existing sound cores
    * improved YMF278B (OPL4) emulation and OPL4 FM-PCM balance
    + more accurate playback of YM2203/YM2608 FM when the song changes the clock mid-song (e.g. City Connection)
    ! reduced default GameBoy DMG volume - it was overpowering everything else before
    - removed some YM2612 hacks, so some YM2612 VGMs from Project2612 may not start as cleanly as with VGMPlay/in_vgm 0.40.x
    - removed ES5505/5506 emulation (the old implementation was very hackish)
    ! "NukedType" option has values 0 and 3 (filtered/unfiltered YM2612) swapped
    ! file information caching is ignoring the file date again
    + AY8910 panning (also works with YM2203/2608/2610 SSG)
! removed RF5C164 options, it shares settings with the RF5C68 now
! added separate options for C219, was sharing settings with C140 before
- removed old in_vgm logo and replaced it with a placeholder to indicate the libvgm-based build
+ added a button that opens the in_vgm.ini file (useful for editing settings not available in the GUI)
+ S98/DRO support (enabled via .ini editing)


in_vgm v0.50.0
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no release, only VGMPlay had a release with this version


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+ feature added
- feature removed
* bugfix
! changed functionality
