v0.3.0

Big release!

• Created rudimentary tree-sitter grammar
• Added OBS (Observables) for async push-based streaming and scheduling
  • Added OSTRAT for modeling backpressure behaviors
  • Added/extended iteration, consumption, etc. utilities for OBS
  • UNSTABLE: added nonblocking I/O
• Reworked TRY internals
• Added bitshifts