Add "wolf" mob

(from mobs_plus)
- we need to test it,
- reduce the spawn chance of the dirt monster for balance the spawn
with wolf mobs,
- wolf can spawn in pair.

mods/mobs/dirtmonster.lua

@@ -28,6 +28,7 @@ mobs:register_mob("mobs:dirt_monster", {
 		min = 2,
 		max = 8,},
 	},
+	light_resistant = false,
 	armor = 90,
 	drawtype = "front",
 	water_damage = 1,
@@ -54,4 +55,4 @@ mobs:register_mob("mobs:dirt_monster", {
 	step = 1,
 	blood_texture = "default_dirt.png",
 })
-mobs:register_spawn("mobs:dirt_monster", {"default:dirt_with_grass"}, 3, -1, 7000, 1, 31000)
+mobs:register_spawn("mobs:dirt_monster", {"default:dirt_with_grass"}, 3, -1, 8500, 1, 31000)

mods/mobs/sandmonster.lua

@@ -35,6 +35,7 @@ mobs:register_mob("mobs:sand_monster", {
 	water_damage = 3,
 	lava_damage = 1,
 	light_damage = 0,
+	on_rightclick = nil,
 	attack_type = "dogfight",
 	animation = {
 		speed_normal = 15,

mods/mobs/wolf.lua

@@ -0,0 +1,58 @@
+-- Wolf (from Mobs_plus)
+
+mobs:register_mob("mobs:wolf", {
+	type = "monster",
+	hp_max = 15,
+	hp_max = 20,
+	collisionbox = {-0.4, -0.01, -0.4, 0.4, 1, 0.4},
+	visual = "mesh",
+	mesh = "mobs_wolf.x",
+	--textures = {"mobs_wolf.png"},
+	available_textures = {
+		total = 1,
+		texture_1 = {"mobs_dirt_monster.png"},
+	},
+	--visual_size = {x=1, y=1},
+	makes_footstep_sound = true,
+	view_range = 20,
+	walk_velocity = 3,
+	run_velocity = 5,
+	damage = 4,
+	drops = {
+		{name = "mobs:meat_raw",
+		chance = 1,
+		min = 2,
+		max = 3,},
+		{name = "maptools:copper_coin",
+		chance = 2,
+		min = 1,
+		max = 4,},
+	},
+	light_resistant = false,
+	armor = 200,
+	drawtype = "front",
+	water_damage = 1,
+	lava_damage = 5,
+	light_damage = 2,
+	on_rightclick = nil,
+	attack_type = "dogfight",
+	animation = {
+		speed_normal = 15,
+		speed_run = 15,
+		stand_start = 0,
+		stand_end = 14,
+		walk_start = 15,
+		walk_end = 38,
+		run_start = 40,
+		run_end = 63,
+		punch_start = 40,
+		punch_end = 63,
+	},
+	sounds = {
+		random = "mobs_dirtmonster",
+	},
+	jump = true,
+	step = 1,
+	blood_texture = "mobs_blood.png",
+})
+mobs:register_spawn("mobs:wolf", {"default:dirt_with_grass"}, 3, -1, 12000, 2, 31000)