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.