Finish grammar

[LPGhatguy]

In rough order of importance:

• Precedence (I've been putting this off -- simple explanation of precedence climbing/Pratt parsing)
• Assignment (depends on varlist)
• Function Declarations
  • Correct function name declaration (currently only identifiers are allowed)
  • Vararg
  • Anonymous function expression
• String literals
  • Regular single and double quote forms
  • Long-form strings
• Comments
  • Infrastructure in tokens for comments
  • Single line comments
  • Multi-line comments
• Generic For (for-in)
• Remaining binary operators
• Function call without parentheses
• Semicolon as statement separator
• ParenExpression ('(' expression ')')
• Lua 5.2 syntax
  • Goto and labels
• Lua 5.3 syntax
  • Bitwise operators

[LPGhatguy]

Precedence is done and it wasn't so bad.

[LPGhatguy]

Refactored the lexer fairly significantly, which should make testing some of these features easier.

The string literal lexer (which is just double and single quotes) serve as a reasonable example.