Remove obsolete icons that were just kept around until Gentoo updated its ebuild :)
Resurrect the old icons for a bit, until the Gentoo ebuild is fixed...
Major redesign of the build system. Also allow icons to be installed optionally: -DQUASSEL_ICONS=External Will install Quassel's own icons to $PREFIX/share/apps/quassel rather than into the binary itself -DOXYGEN_ICONS=External Will not install our Oxygen subset into the binary and rely on them being installed externally instead Build system is still work in progress, and I have likely b0rked building on Win and Mac.
Rename and move our own icons to match icon naming/location standards