v2.1.0

The changes for this release

• lsdsng-export can now export entire folders (searches them for saves)
• lsdsng-import no longer imports files ending with .WM.lsdsng to the working memory. Instead, it gained a -w flag for that purpose.
• lsdsng-import can take multiple sav files as input to concatenate them
• lsdsng-import recursively searches folders for input
• lsdj-wavetable-import gained a --decimal flag to tell it the indices are not in hex
• Added functionality to read/write song data up to 8.9.3 (mainly envelope data)
  • This isn't used in any of the tools yet, but the API is in the library
• Fixed a small bug where song filenames outputted from lsdsng-export contained spaces.