Fixed fPIC link failure with arm and sparc architectures, fixing issue #757
Added TargetArch.cmake, from
https://github.com/petroules/solar-cmake/blob/master/TargetArch.cmake
07f3bf8d98a3
Hedgewars.png had a resolution more than twice as high as required; also fixed some (mostly obsolete) code that also contained a typo that would cause a warning/note in clang