Built-in TrueType fonts

Even with upstream changes, font configuration requires some skills and not every user can do it without errors.

What I suggest to do:

1. Provide Pelagiad and Ayembedt fonts with OpenMW.
2. Add an option which tells use or not to use TrueType fonts.
3. Add fonts setup to the launcher.

It will be enough for 99% of cases. If a user wants to use a custom fonts setup, we can implement #4974 (closed), so he will be able to tweak openmw_font.xml as he wants.