Remaining custom override and Herelink specific problems

[DonLakeFlyer]

• Save to SD card says no sd card
  • Possibly a manifest permission problem
• Had to modify QGCLogger.java
  • Uses BuildConfig thing which doesn't seem to be available
• Home app setup not supported
  • Previous build system had a build mechanism to set this
  • Probably can be handled with the overriden manifest file
• Requires using older gradle settings
  • build.gradle
  • gradle-wrapper.properties
  • Without these older setting the app won't install to the Herelink
• Can get Qt Creator build to work without upstream android stuff
  • Mods to custom/android/AndroidManifest.xml and build.gradle need to be in upstream locaiton as well otherwise androiddeployqt fails
  • This doesn't happen in CI
• The apk file name doesn't track the application name
• Need to add QGC_HERELINK_AIRUNIT_VIDEO define to get correct video support

Need to look at older qmake custom build capability for remaining missing things