Qwidoski post effects

This resource packs adds two new effects to /posteffect: /posteffect add @s qwidoskisposteffects:black_white changes brighter pixels to white and darker to black. /posteffect add @s qwidoskisposteffects:invert_each_second_line adds an overlay of moving horizontal lines (see images)!qwidoskisposteffects:invert_each_second_line !qwidoskisposteffects:black_white EPILEPSY WARNING! SOME OF THE EFFECTS ADDED MIGHT HAVE A NEGATIVE IMPACT ON PLAYERS WITH PHOTOSENSITIVITY!