- Add support for type checking boxed types
- Remove support for converting string and number literals
- Add the `typeof()` operator for GType literals
For normal compilation, use .typelib files rather than .gir XML files.
This is much faster.
Rather than using libgirepository, which would try to actually load the
libraries, we use a custom parser.
The language server will still read XML because it needs to access
documentation, which is not in the typelib, but that's generally fine
because it's a long lived process and only has to do that once.
