This was already documented as working, but turned out not to work.
Now one can call any of the run(...) functions to guarantee a restart
of the statemachine. Using run() without parameters from a callback
function re-uses the old callback information.
Introduces a new enum AIStateMachine::active_type that keeps track
of on which list the statemachine resides, if any. This was necessary
because run() calls cont() which now can be called while the
statemachine is already on the active list, so it needs to know
more than just if it's on the continued_statemachines list or
not.
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