v0.9.0 - New commands; better and faster sync.

Features

• New command belay run to run a file on-device.
• New command belay exec to execute a python string on-device.
• sync improvements:
  • New argument dst; folder to sync file into. Defaults to "/";
  • New argument ignore; uses gitignore pattern matching to ignore files during sync. Defaults to common undesired files.
  • New argument mpy_cross_binary; if provided, will compile .py files into .mpy prior to syncing.
  • Can now sync a single file. Other files will not be deleted when syncing a single file.
  • Can now keeps all untouched files if keep=True.
  • Changed file hashing function from FNV-1a-64bit to FNV-1a-32bit for speed. Optimized implementation with native and viper decorators for a large speed boost
  • Parallelized pre-processing operations for faster syncs.
  • Misc bug fixes; a lot more unit testing.