Add early implementation of sitting by right-click

currently uses function from homedecor_seating/armchairs.lua... need to work on it

api.lua

@@ -33,7 +33,16 @@ function mcl_decor:register_chair(name, def)
 		_mcl_hardness = def._mcl_hardness,
 		_mcl_blast_resistance = def._mcl_blast_resistance,
 		sounds = def.sounds,
-		-- TODO: make player sit on the chair by rightclick (maybe via homedecor funcs?)
+		on_rightclick = function(pos, node, clicker, itemstack, pointed_thing)
+			if not clicker:is_player() then
+				return itemstack
+			end
+			mcl_player.player_set_animation(clicker, "sit_mount", 30)
+			pos.y = pos.y-0.5
+			clicker:setpos(pos)
+			clicker:set_hp(20)
+			return itemstack
+		end
 	})
 end