run.sh: add runtime lib dir t path

we should put scripts and at runtime needed binaries in the runtime libdir, not in a global bin dir
cmake: move bittest and crashdlg into runtime lib dir

these are never called outside desurium, so they should be in the runtime lib dir
usercore: user findlib.sh to find installed libs

fixes #370
Merge pull request #421 from karolherbst/bug370

add findlib.sh