android: set target sdk version to 19 (kitkat)
minor design experiments
android: removed unused layout
android: layout: introduced categorys (own vs. network files)
android: cannot select category headers
android: layout largely implemented
android: missing images + done-image when dl is complete
android: tap to open downloaded files
android: layout for own files
android: file-open now works for much more files
android: improved behaviour when lxc is called via intent + display a dialog if input is no file and cannot be shared
android: hold to remove for own files
android: hold to remove for remote file (reset functionality)