Add compiler options for printing various trees, add intermediate language tree

Remove unused folders

Calculate escapes

Ch 6 complete -- needs tests

Fix parse error

Tests complete. Need to fix parse error associated with RandomParseError Test

Various bug fixes in the semantic analyzer and tests

Fix project file

Make modules internal

Throw exception on semantic or parse errors

Initial type checker

All type checking except function and type declarations; no testing

Some type checking completed

Full parser

Various bugfixes; more tests; add traces