Added returnmirror mod (without mana for the moment)

- Added return mirror mod, mana will follow
- Added a drop of mirrors in mese_monsters' definitions
- Fixed a line return in areas

mods/mobs/mese_monster.lua

@@ -43,6 +43,10 @@ mobs:register_mob("mobs:mese_monster", {
 		chance = 2,
 		min = 2,
 		max = 5,},
+		{name = "returnmirror:mirror_inactive",
+		chance = 5,
+		min = 1,
+		max = 5,},
 	},
 	light_resistant = true,
 	armor = 80,