smooth biome moss

add biome blending to moss block, donesnt work with moss carpet unfortunatly. /!\ NEEDS either continuity OR optifine to work as it use theyre CTM feature /!
smoothing also need continuity or optiphine as it was not intentional at firs, i will have to remake the texture in the plain for everyone one day but for now, everything in this pack need continuity or optifine