Deleted obsolete script

Deleted "Swap with Background Layer" because it is now a default
function in Glyphs.
Updated Stitcher

Added a slider to the Stitcher UI in order to finetune dot intervals.
Removed the option to keep existing components because it made no sense.
Re-arranged Paths Scripts, added scripts

1. Moved some scripts from Effects to Paths
2. Moved ome scripts into subfolders
3. Deleted Effects/Turn off-curve into in-curve