* Add enabled state for modifiers
* Add enabled state for interpolators
* Move AutoTrigger to effect not emitters
* Remove LineUniformProfile
* Set Enabled field true by default
* Don't render invisible emitters
* Remove unused member
* Document update method
* Add documentation
* Remove test now that LineUniformProfile was removed
* Fix unit tests
* Refactor particle system
* Use correct alloc
* Use original ParticleIterator imlementation for zero allications.
* Move ParticleIterator to its own class instead of a nested class
* Mark nullable
* Add fallback mechanism for loading textures when it's an image file and not an xnb