Xml typedef inheritance fix

[TwitchBronBron]

This fixes a bug where the typedefs in parent components were not properly recognized in child component scopes.

I've introduced the concept of "own" files for scopes:

• all files: every file the scope references, either in its own direct references, or from parent scopes (like xml component inheritance)
• own files: only files directly referenced by the current scope (does not account for parent scope files)

[TwitchBronBron]

@georgejecook can you please review this, and then also test it out with your projects (since you were the one who found this issue).

[TwitchBronBron]

@georgejecook thanks for testing the PR and verifying it works for you.