fix: constructors were ignoring default values for property arguments

fix: tests

Delete test.ts

style: using rustfmt for formatting

fix: other generator files

fix: error message formatting

feat: generator support

feat: BigInt type

feat: constructor properties are now put after `super()` call

feat: proper BigInt & octal literal parsing

refactor!: errors output to a string

feat: basic namespace parsing (not fully working)

refactor: spaces

feat!: AST strings now reference the source file

feat: moved to arena-based allocation