Add getWorkerTask functions
Add getWorkerTask functions

They provide a way to easily create a task in a worker thread and get a handle to it.

Signed-off-by: Luca Niccoli <9aceb8316c1ad8fca912e97fd9f99ff001121dd8@gmail.com>

nathanchristenson/vibe.d,etcimon/vibe.d,fast4shoot/vibe.d,Mihail-K/vibe.d,nathanchristenson/vibe.d,Yoplitein/vibe.d,Geod24/vibe.d,etcimon/vibe.d,Yoplitein/vibe.d,jkm/vibe.d,rejectedsoftware/vibe.d,redstar/vibe.d,DBankov/vibe.d,alphaKAI/vibe.d,sigod/vibe.d,alphaKAI/vibe.d,schuetzm/vibe.d,sigod/vibe.d,ColdenCullen/vibe.d,nathanchristenson/vibe.d,sigod/vibe.d,Yoplitein/vibe.d,gedaiu/vibe.d,machindertechnologies/vibe.d,etcimon/vibe.0,mfrischknecht/vibe.d,Kozzi11/vibe.d,dkillebrew/vibe.d,chalucha/vibe.d,jkm/vibe.d,etcimon/vibe.0,yannick/vibe.d,AndreyMZ/vibe.d,veelo/vibe.d,alphaKAI/vibe.d