This enable sprite animation for the background.

branchID - the current branch

page - the current page

animation_type - 1 for per frame image animation and 2 for atlas image animation

has_loop - has loop?

has_continuation - to be use if animation continue more than one page

sprite_animation_loop_start - start the loop from which frame? Can be use for talking animation then idle animation

fps - the frame per second to animate

atlas_width - only use if type = 2

atlas_height - only use if type = 2

atlas_amount - only use if type = 2

NOTE: Type 2 required "vne_set_bg()" "image_id" or "filename$" to be set as the atlas image!