TODO: reasoner: goal system: async higher order goals

[PtrMan]

Idea is to expressing higher order goals as declarative events, which are then processed with the nature goal system.

ex:

<(HG0*make_coffee) --> GOAL>. :|:

(<(HG0*make_coffee) --> GOAL>, (^nal9_execAndInj( (^really_make_coffee, HG0), G0))) =/> G0
G0! :|: