- implement swipe left/right and tap gestures for presentations
- move some classes to their own files

Change-Id: I3ddd3e17ec809c87097d5515f08038bbc969764f
Reviewed-on: https://gerrit.libreoffice.org/48231Reviewed-by: jan iversen <jani@libreoffice.org>
Tested-by: jan iversen <jani@libreoffice.org>