First part of SPEC file merge
- Split out main AppStream metadata in its own file, like the fonts subpackage.
- Make sure rpmlint does not fail when checking the SPEC file.
- Simplify fonts packaging and fix font package rename upgrade.
- Clean up build options (sorting, duplicates, obsolete options, etc.).
- Enable buildinfo.
- Remove manual installation of manpages and use CMake option.
- Add blenderplayer man page.
- Remove manual installation of icons, the install target is already installing them in the same way.
- Fix -std=c++11 warning during build.