This alters the build setup to create two executables based on
practically the same CPP static lib but with different QML
dirs and translations.
This also adds a cmake option
-Dlocal_qml=ON
when passed it will create an executable that will load the QML
from local disk instead of using the compiled-in version.
The main advantage of that is that there is no need to recompile
after each QML change.
