Replacing heading2D with heading for all general examples. Issue #1627
Replacing heading2D with heading for all Nature of Code examples. #1627
Merge pull request #1627 from ybakos/1627_header2D_deprecation

Replace heading2D calls with heading
removing library compilations, additional cleanup
working through contrib cleanup and simplification
more cleanup of contrib managers
always set setgetPixels to false at the end of flush()
change Contribution to an abstract class, remove more unnecessary code, fix copyright info
Merge branch 'master' of github.com:processing/processing
removing static methods and more housecleaning
Update to Esefera example, re: issue #34
more cleanups, removing static methods
Merge branch 'master' of github.com:processing/processing
added mode to primitive PShape of type ARC
fix for crash on startup
more work on contrib manager, still not ready
Merge branch 'master' of https://github.com/processing/processing.git
fixed issue with transparency and PShader filters
set default ambient color from fill
Fixes #1498