Redesign stealing as a bump side effect?

[nitaku]

Bump parameters need to be fine tuned to either produce reliable bumps when ships touch, or to give the feel of "enough speed" to bump. Also, a refactoring of stealing has to be done in order for this to work.

[nitaku]

Done. And bumping has now a zero threshold, so it happens whenever ships touch. Moreover, since balls and the like are now shown more clearly as grabbed object, there's no need to experiment with dropping stuff when bumped.

[nitaku]

The "bump" signal could still be leveraged to simplify stealing though.