Added CSV import, fixed #1186. Also cleaned up motion and user CSV import.
Merge pull request #1226 from normanjaeckel/AgendaImport

Added CSV import, fixed #1186.
Fixed #1197: Use big heading for custom slides without text.

Keep last projector scale/scroll values after activate new slide.
Fixed #1197: Use big heading for custom slides without text.

Keep last projector scale/scroll values after activate new slide.