Dereferencing/referencing of streams and timers #180
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This PR implements dereferencing and referencing of streams and timers (closes #107).
Signals are deferenced by default and can not be referenced (there is no use case where we only have signal watchers and nothing else (that actively prevents #175), if anything like that is required for some unreal ancient communication cult, plain PHP can do the job too).
To avoid BC, a new loop interface was created which extends the loop interface, to allow implementing new methods. This interface should be removed for v2.0. The new interface trick was suggested by @WyriHaximus.