Bindings coverage

[arcnmx]

Clean up Gir.toml and ensure all bindings are exposed:

• [ ] resolve remaining generation failures: grep -rE '//(pub )?fn' (add them to Gir.toml as eitherignoreormanual`)
• [ ] ensure that anything marked manual is actually implemented
• [ ] go back over manual functions and check to see if gir could actually generate them with the right settings?
• [ ] set up a check/test that gir and sys gir produce no uncommitted changes to the codebase