Multiple kits build at once is needed to be able to build multiple Android ABIs at once and pack them into the same APK.

Even Android supports multiple apk(s) is a pain in the a$$ to do it and even they are suggesting the usage of a single APK for it : https://developer.android.com/google/play/publishing/multiple-apks.html#SingleAPK

To fix this issues I propose a new settings page to the project perspective where we can set all the (compatible) kits that should be built at once.

For Android, I also need to know which one is the first and which is the last one. The first kits that runs androiddeployqt it must remove all the libs found in the android-build folder, and copy only it's own libs, the next androiddeployqt will copy their own libs. The last kit will copy its libs and create the .apk.