[CVS ci] event-handling-4

[Leopold Toetsch]

I've committed a first attempt towards event handling. Caused by the 
absence of further design docs it might be not a scheme, that will 
finally be run, but I hope that at least parts are useful.

Its a bit tested w. dynoplibs/alarm.pasm
$ parrot dynoplibs/alarm.pasm
0
1
alarm
Please s. docs/dev/events.pod for more

Comments welcome,
leo