More support for using the library from more than one activity
We need to pause an Activity in the following way:
1) Activity.onPause()2) View.onPause()3) Library.onPause()
otherwise sometimes there are artifacts when pausing!
Fixes for the merge.
Correct the Legal notice.
Rename all the classes that are not exported to application to 'Internal'
Improve the 'PostprocessTree' app. Shows bugs in postprocessing.
New 'PostprocessTree' app (unfinished)