[FIXED] RenderResolutionDivisor is applied twice when the debug setting value is changed (but not on initialization)

[FIXED] Crash when @setsphere is issued with ALM enabled without shadows, ambient occlusion, depth of field, or antialiasing

[FIXED] @sitground=force from an object holding the only @sit=n,unsit=n reports the avatar standing and sitting illegally

Add support for multiple overlays in the same linkset (and support permanence in @setoverlay restrictions that aren't currently active)

CATZ-590: Unpredictable results occur when both @setsphere and @setoverlay are set by the same object

Allow effect ids to be reused for each visual effect (but enforce uniqueness across all instances of the same effect)

[FIXED] LLVisualEffectParams::step(bool isLast) will always be called with isLast == false (fixes RLVa spheres issues when AA is disabled)

  * Permission check changed from hasBehaviour to hasBehaviourExcept (consistency with @sit and @unsit)
  * Added stand up/ground sit behaviour to mimick RLV behaviour

AMD shader compile error + just have anyone with older drivers/hardware load the explicit one for now

[FIXED] Only one @setsphere effect is ever visible (broken when code moved to LLPipeline::renderFinalize)