Allow knossos to run static-linked AppImages
Allow knossos to run static-linked AppImages

Move check for AppImage executables to common location so the check
always runs.
Add exception handling in case ldd is run on a statically linked
executable (belt & braces)

MjnMixael/knossos,MjnMixael/knossos,MjnMixael/knossos,MjnMixael/knossos,MjnMixael/knossos