Support not_in_craft_guide group

GROUPS.md

@@ -97,6 +97,7 @@ Action groups:
 * `fake_liquid`: Node is registerd as liquid but it's not actually a liquid
 * `flora`: This is a plant that spreads on Dirt with Grass
 * `soil`: Usable by hoe
+* `not_in_craft_guide`: Item won't appear in craft guide
 
 Legacy groups:
 * `flammable`: Considered flammable (Note: This game has no fire)

mods/craftguide/init.lua

@@ -337,6 +337,7 @@ function craftguide:get_init_items()
 	for name, def in pairs(reg_items) do
 		local is_fuel = get_fueltime(name) > 0
 		if not (def.groups.not_in_creative_inventory == 1) and
+                   not (def.groups.not_in_craft_guide == 1) and
 		       (get_recipe(name).items or is_fuel) and
 			def.description and def.description ~= "" then