Test comments.
Rename tests.
Reset flags in EscapeString.
Lexer string test.
Slash is not an operator token.
Add lexer-tokens test.
Don't quit on first lexer failure.
Discriminate between int and float constants in output.
Allow whole number floating point constants with only trailing point.
Be more strict and consistent in float number parsing.
Allow "expect = fail" in tests. Add lexer-fail, update lexer-tokens tests.