Log Message:
nestopia: Update to 1.50

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1.50
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Shell:

 Additions:
  - Added ability to output data from homebrew module (Phil Smith)

libretro:
 Additions:
  - Button shift option
  - Input bitmask support (TwinAphex)
  - Enhanced core options (TwinAphex)
  - Build in NstDatabase.xml

Core:

 Additions:
  - Homebrew module (Phil Smith)
  - Support for mapper 31 (rainwarrior)
  - Support for mappers 28 and 30 (retro-wertz)
  - Support for UNL-KS7031 (retro-wertz)
  - Support for MMC3 Big CHR-RAM Board

 Fixes:
  - Deterministic Save States (creambits)