Update SimpleActuator.hx

Fix for JavaScript target to make it work.
The problem was in haxe.Timer, because it only can get time in ms(Int), not Float.
Update SimpleActuator.hx

changed to macro, to calculate interval value at compile time
Update SimpleActuator.hx

Removed $v{}
Merge pull request #30 from as3boyan/patch-1

Update SimpleActuator.hx