Rename a lot of files

* about_dialog -> AboutDialog
* bb_editor -> BBEditor
* export_project_dialog -> ExportProjectDialog
* setup_dialog -> SetupDialog
* string_pair_drag -> StringPairDrag
Rename a lot of classes

* aboutDialog -> AboutDialog
* bbEditor -> BBEditor
* exportProjectDialog -> ExportProjectDialog
* setupDialog -> SetupDialog
* stringPairDrag -> StringPairDrag
Rename bbTrack, trackContentObject and friends
Rename basicFilters/basic_filters.h
Rename tabButton/tab_button
Rename tranformable_auto_model to TransformableAutoModel


I think this class isn't even used, probably safe to remove?