D: start documenting stuff

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+Fixmes:
+
+Lexer:
+* Fix `is_whitespace`, add more tests
+* Add more thorough tests for idents for XID_Start & XID_Continue
+* Validate that float and integer literals use digits only of the appropriate
+  base, and are in range
+* Validation for unclosed char literal
+* Strings are completely wrong: more tests and comparison with libsyntax.
+* Comment lexing is completely wrong
+
+Parser:
+* Figure out what is the expected state of attribute grammar.
+  Token trees or something more structured? Token trees would be unfortunate: no extend selection =/
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