Also adds the source document to the RazorSyntaxTree and does some cleanup
related to this. This lets us verify which tree goes to which document and
that seems important.
Added basic tests to verify that parsing happens, though it's not being
used for anything right now.
- Source ranges currently aren't normalized when they're input into the system. Due to how we serialize pieces of the code this breaks cross plat because of newline differences.
- This is a temporary work around to get the build passing cross plat.
- Removed existing type names used to track `@functions`, `@section` and `@inherits`.
- Updated parsing logic to reflect existing directive behaviors.
- Added additional IR and syntax tree pass in order to fulfill the default directive expectations.
- Updated tests to to expect new extensible directives parse structure.
#894