Create a global sprite pool for new sprites to be created

[stringdotjar]

There should be a global sprite pool (located in the global Flixel class), with a helper methods in the Flixel class such as newSprite(), with parameters that a normal FlixelSprite would take. This function should free a sprite from the pool and return a freshly new, reused sprite object

It should look something like this for creating new sprites:

FlixelSprite sprite = Flixel.newSprite();
FlixelSprite spriteParams = Flixel.newSprite("path/to/image/texture");