UI upgrade
Merge pull request #2 from limejelly/master

UI - Changes entity table to an outline view
Merge commit 'db097d3f6e2fcb88b7c9fc79b7983197dd5a101c' into develop
Merge remote-tracking branch 'upstream/master'
Adds XML persistence type when user selects the file tab
Merge commit '2b48d6f8a24644e46cf12cff8b804a905aa02c41' into develop
Fixes an exception when right clicking on "ENTITY' in the entity table.
Merge remote-tracking branch 'upstream/master'
Fix #6: wrong index passed to filter data