Add convenience objects to use taskit in Bloc

[tinchodias]

Created with Pablo last week.

Demo script:

space := BlSpace new.
space
	useMorphicHost;
	extent: 200@200;
	show.

"action 1"
space enqueueTask:
	(BlTaskAction new
		action: [ space root background: Color random ];
		yourself).

"action 2"
runner := TKTBlSpaceRunner on: space.
runner schedule: [ space root background: Color random ] asTask.


"repeatable 1"
space enqueueTask:
	(BlRepeatedTaskAction new
		delay: 250 milliSeconds;
		action: [ space root background: Color random ];
		yourself).

"repeatable 2"
service := TKTParameterizableService new.
service name: 'Change background'.
service step: [
	space enqueueTask: (BlTaskAction new
		action: [space root background: Color random ];
		yourself) ].
service stepDelay: 250 milliSeconds.
service start.
"service stop."

[tinchodias]

Demo script of repeatable tasks:

space := BlSpace new.
space extent: 200@200; show.

"repeatable 1"
space enqueueTask:
	(BlRepeatedTaskAction new
		delay: 250 milliSeconds;
		action: [ space root background: Color random ];
		yourself).

"repeatable 2"
service := TKTParameterizableService new.
service name: 'Change background'.
service step: [
	space enqueueTask: (BlTaskAction new
		action: [space root background: Color random ];
		yourself) ].
service stepDelay: 250 milliSeconds.
service start.
"service stop."

"repeatable 3"
service := TKTBlSpaceService on: space.
service step: [ space root background: Color random ].
service stepDelay: 250 milliSeconds.
service start.
"service stop."

[tinchodias]

@labordep I was talking you about this "experiment" on ways to use/specialize TaskIt for Bloc.