add setPosition to base IFlxSprite interface, demos using the members array need access to setPosition without casting.
Fix alpha changes on cpp and neko
Option for flickering to have a ForcedVisible end value, repetitive calling of flicker may make your object not visible when you want it to be. This fixes a bug in Mode Demo where Spawners dissapear when shooting them. Behaviour will remain the same without ForceVisible parameter.
Fix neko null error for FlxBar closes #643