checking in work on lexer and caching
more work on the tokenizer
Adding named character entities
more tokenizer work
More implementation of the lexer
indentation fixes and unit test updates
Test coverage at 100% for utility functions
Tokenizer is somewhat functional
hex string lexing
wysiwyg strings and hex strings
Tokenizer and highlighter functional
Fixed a few infinite loop bugs
Moved lexer over to std.d
special token sequence
Fixed filtering of comments, whitespace, etc.
Built-in types are keywords
DDOC
Special tokens, ddoc, better highlighter colors
struct
parser fixes