* Fix crash trying to enter particle mode when the particle modifier is disabled in the stack. * Fix redraw being very slow due to the draw function causing the object to be recalculated on each redraw (through PE_draw_object). * Removed the system where PE_get_current would automatically create the particle edit, this would run from poll() functions, which gave all kinds of issues, now it only creates the data on enter/exit and switching active particle system.