Allow filtering parameters

Properly handle jni exceptions.

Fix for #7268: AppImage won't start

Add support for custom installer steps

Add QGC_DISABLE_INSTALLER_SETUP to CONFIG will override config in QGCInstaller.pri.
However, QGCInstaller.pri can be imported in the custom one. In this way
a custom build can generate it's own installer config or add pre and post steps.

Add support for AppImage customization