initial commit

Foldertree can be created
FolderSyncTree component words correctly
Overall Gui is implemented
implemented some images for visualisation
Foldertrees can be compared
Foldertree toString added
FolderTree set/isStateIgnore added
added/created images
implemented basic functionality
implemented keys:
f5 refresh
del delete item on file-system

small improvements
implemented synchronization on delete
removed comments corrected intendation