Convert Generic to stretchless API.
Move to AndroidX, target API level 29.
Move the Effects.setStretch to Meshbase.setStretch
Correct the Legal notice.
Rename all the classes that are not exported to application to 'Internal'
Further improvement for the Generic app.
Refactor the 'Generic' app.
Improve the way Center & Region bitmaps are shown in the Generic app.
Rename the 'Effects3D' app files.