Pass on simulation of events

[tinchodias]

I take as starting point this method:

Bloc/src/Bloc/BlSpace.class.st

Line 284 in 6cfbca7

BlSpace class >> simulateEvents: aCollectionOfEvents on: anElement [

Points to analyze/discuss:

• Do not support simulation of events on an element that has no space; it's an unrealistic scenario
• Remove aSpace dispatchEvent: BlSpaceEventsProcessedEvent new. The space's phase doesn't do it like that.
• we may prefer to replace aSpace dispatchEvent: anEvent by aSpace hostSpace enqueueEvent: anEvent to emulate what BlOSWindowEventHandler or BlMorphicEventHandler do.
• Do we need to send so many pulses? could we expect that the sender of simulate* at the end uses "pulseUntil*" to wait the events to be processes by the host loop?

[tinchodias]

In addition, if this method makes sense:

BlSpace
	pulseUntilEmptyTaskQueue: aSpace
	timeout: 200 milliSeconds

then we might move it to instance side:

aSpace pulseUntilEmptyTaskQueueTimeout: 200 milliSeconds

[tinchodias]

Also, BlSpace class>>#pulseUntilEmptyTaskQueue:timeout: should wait if aSpace universe hasDeferredActions

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EDIT: This was fixed in #478

[tinchodias]

This pass might open the door to remove BlUseAsyncFeatures which is now only used by Scripter's strategies (sync and async).