Deprecate filetype_id

[techee]

Replace filetype_id with GeanyFiletypeID and deprecate the macro.

[codebrainz]

I know it's not from this PR, but I wonder why use a macro instead of a typedef for compatibility?

[b4n]

I know it's not from this PR, but I wonder why use a macro instead of a typedef for compatibility?

I don't see a reason, and if it was a typedef we could mark it with GEANY_DEPRECATED_FOR(GeanyFiletypeID). We probably should change this right now before a release and people starting to throw in #ifdef filetype_id -- no, I doubt anybody would do that, but still.

[b4n]

@techee I re-did virtually the same in #932. For some reason this branch has merge conflicts and it was so easy replacing the occurrences (and checking them on the way) I didn't even try using your patch. If you'd like credit, I can fix that.

That other PR replaces the macro with a typedef, too, and marks it deprecated.

[b4n]

Oh, conflicts arose from the TMParserType change apparently.

[codebrainz]

I seem to remember there were quite a few places where gint was used for filetype ID, should we fix those now too?

[techee]

Deprecated by #932. Closing.