Deduplicate whitespace tests
Bit of formatting cleanup
Add lexer grammar for symbols
Add more lexical rules
Add string lexer rule
Tokenize bad strings
Add baduri tests and implementation
Add hash lexer
Add number lexer
Add percentage and dimension
Add URI
Add unicode range support
Lex CDO and CDC
Add comment lexer
Cleanup
Add function lexer
Add includes lexer
Add DashMatch
Add Wempty
Simplify declaration list parsing