FEATURE: try runnable
BUGFIX: use timeput for requests - removed __del__ in generic thread
...
REFACTOR: rename
REFACTOR: rename
REFACTOR: BrainThreads
FEATURE: threading stuff
FEATURE: schduler thread
FEATURE: scheduler_thread as member
FEATURE: add task buffer
FEATURE: adapted threading for thumbs
FEATURE: expand drop_tree_items on click