Make expression types public

Add time measurement procedures

Expose syntax and error maps on native modules

Expose comment delimiter in parser

Make MultiLine a class instead of a struct

Improve core library

Inline core lib

Change optimize procedure to accept a reference

Add . and _ to characters allowed in symbol names

Capture stack trace in errors

Add thing procedure

Fix newline removal

Extend supported types for comparisons

Add floor, ceil, and round procedures

Add position and heading procedures