Add blueberry bushes

game_api.txt

mods/default/README.txt

mods/default/craftitems.lua

mods/default/mapgen.lua

mods/default/nodes.lua

mods/default/schematics/blueberry_bush.mts

mods/default/textures/default_blueberries.png

mods/default/textures/default_blueberry_bush_leaves.png

mods/default/textures/default_blueberry_bush_sapling.png

mods/default/textures/default_blueberry_overlay.png

mods/default/trees.lua

mods/dye/init.lua

schematic_tables.txt