glifo: Fix interaction with complex paints

[LaurenzV]

As part of our migration of glifo, we've basically completely broken the interaction between glyphs and complex paint transforms. This PR makes two changes to restore the expected behavior:

1. In a glyph run, we keep track of the original paint transform and later on apply a correction to make sure that each glyph is drawn with the correct paint transform.
2. We disable glyph caching for glyphs with complex paints since our image tinting API only supports solid color fills.

I added some more new tests to prevent future regressions. Thanks to @waywardmonkeys for finding this.