apply linker flags to all relevant targets

explicitly set the origin linker flag so that $ORIGIN is used correctly

add a possible lua include path

less cached cmake output

code typos

use QT_DEBUG which is always added

respect C and CXX flags

freepascal on windows only supports shared libraries

nitpick

heavily rework lua discovery and linking, needs testing but it's more similar to what we do for other libraries now

oops, haskell uses gcc to link, correctly pass flags

since shared libs are now our friends, let's optimise them

aaaaand let's not forget about lua, which has also a slightly revised build process

drop the '_'

and now also avwrapper can be shared/static, add visibility to its exported functions, drop (needed only when static)