Important:
- fix laylines on boats
- integrate lookat
- animate lookat
- fix printing document
- statechart
- jib
- bowsprit

Normal:
- toggle number display
- select colour for marks
- arrows
- clean selection before output
- translate boat types in popup
- more boat shapes
- one line for config options and their toggle
- open in new tab
- more flags

Wishlist:
- gpx import
- backtrack edit
- insert between boats
- starting a boat at a later number
- timing for the start boat
