Add Qt5/QML building framework to contrib/android:

- update requirements file for building PyQt5
 - use separate .buildozer directories for qml and Kivy
 - add GUI and ARCH parameters to android/build.sh

contrib/release.sh

@@ -125,9 +125,9 @@ if test -f "dist/$apk1"; then
     info "file exists: $apk1"
 else
     if [ ! -z "$RELEASEMANAGER" ] ; then
-        ./contrib/android/build.sh release
+        ./contrib/android/build.sh kivy all release
     else
-        ./contrib/android/build.sh release-unsigned
+        ./contrib/android/build.sh kivy all release-unsigned
         mv "$apk1_unsigned" "$apk1"
         mv "$apk2_unsigned" "$apk2"
     fi