Swap logging level back to Debug

Finish parsing code

Add Version parsing

Add Debug parsing

Add StaticForeach parsing

Also fixed syntax error in test file (oops) and added Mixins to
DeclDefs.

Complete StaticIf parsing

Involved fixing a bug in EqualityEx parsing in which it tried to parse
another EqualityEx which would always require an operator. Changed this
to try and parse an EqualityEx, but if it fails then fall back to a
ShiftEx which has an optional operator and can cascade down to primary
expressions.

Add several new parsing functions

Notably added: TypeMixin, TypeDef, EnumDef, UnitTest, and TemplateDef.
StaticIf added, but doesn't seem to be working properly yet.

Fix handling of EOF and add parsing of AliasDefs

Add parsing for FnDefs

Complete expression parsing

Write considerable disparate parts of the parser

It currently doesn't successfully parse the test file. There are a slew
of issues with the parsing code that leads it to get caught in
underisable situations that need to be debugged and teased out.

Start writing statement parsing code

Write SimpleFnParam parsing

Write additional expression-parsing code

Add statements module to model

Add FnParamDef class and ParamAccess method

Replace more complicated CoreEx rules with Items

Write majority of expression parsing code

Add `list` method that takes a delegate

Fix issues with syntax spec