fc-cache call dropped (from scriptlets)

copy-paste error fixed in de.urwpp.URWCoreFontSetLevel2.metainfo.xml file

added %check section for validation of AppStream files

temporary workaround for BZ #1534206

Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild

typos & syntax fixed for AppStream files
priority/ordering decreased [60->61]

urw-base35-fonts-20170801-000-split-urw-fallback.patch added
decrease the fontconfig priority/ordering value to 60 (bug #1494850)
set same priority value for urw-fallback.conf as for other files (bug #1495199)

rebase to 20170801 version
fontconfig priority value updated to 35
error messages from 'xset fp rehash' suppressed (bug #1466254)
AppStream files added into (sub)packages
fontconfig files added into (sub)packages
fixed fonts path during %install
source location updated to point at github.com

%description line in 'fontfamily_subpkg' macro split
requirement for 'fontpackages-filesystem' added
mark 'font.dir' and 'font.scale' as %ghost files
fix the upgrading process (for Obsoletes|Provides|Conflicts)
simplify creation of the subpackages with auxiliary %fontfamily_subpkg macro
update the fontconfig cache and X11 Logical Font Description database
initial version of specfile created