Implement SKIM parser

[PaulBatchelor]

SKIM (SndKit Intermediate Machine) is a binary protocol that would enable the construction of patches in sndkit. It is designed to be easy to use with other small languages and environments such as Uxn or Retroforth to procedurally generate sound patches. At the moment, only a proof-of-concept in C exists.

Were this to grow legs, the idea would be to build a SKIM parser for Boing^3. Theoretically, a patch generated in sndkit could then be loaded up in Boing^3 and sound virtually the same.