Bug Fixes and initial libretro core

All Platforms

• Fix behavior when drawing coordinates beyond sprite sheet bounds
• Fix mget bounds check being off by one on upper bounds (fixes some visual artifacts in map() and tline() calls)
• Fix some text wrapping bugs
• Fix some text coloring bugs
• Fix bugs keeping track of smaller than default character size and line heights
• Fix a bug with music playback where looping sections were cut short (thanks @fringd)

Miyoo Mini (standalone app)

• Add double buffering to fix occasional screen tearing

New Platforms

• Add experimental libretro builds for Miyoo Mini and Android.
• NOTE: when using either libretro core, you may need to also add fake08_libretro.info to your cores directory for some features like save states to work. This file should now be included in the release zip. Slightly more detailed instructions in the Usage section of the readme