Set Nearest Neighbor as default filter if the current one is not available

Both in Preferences/Global and per core (+ selection)
Cleanup on last commit
Merge pull request #971 from loicloic/master

Set Nearest Neighbor as default filter if the current one is not available
Lazy fix for lion controls setup animation issues. (Fixes #825).
Game scanner starts counting at 1.
Make sure all documents are saved if the user asked us to quit the app.
Remove two unused experimental system plugins from build target
Set version 1.0.1