Particle Editor: Dynamic Positioning

Problem: Currently the last clicked position of the mouse within editor is new x/y preview coordinates. There is no way to force the particles to begin at bottom of screen or turn off auto click for positions.

Goal: Have a global checkbox within editor that toggles if particle emitter position is locked to center of area or can be clicked to begin elsewhere.

Result: The preview area can now be toggled to be interacted with or not.