Adds the unrand axe Frostbite, a +8 exec axe of freezing clouds

the +8 frozen axe "Frostbite" {freezing cloud, *Noise +Fly rC+}. Base type is executioner's axe. Has a 20% chance of leaving a short-lived (3-5 turns) freezing cloud on a monster on a successful hit. Has blizzard-and-ice themed noises. Comes with two terrible placeholder tiles.
crawl · Nov 26, 2015 · b13830c · b13830c
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commit b13830c
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diff --git a/crawl-ref/source/art-data.txt b/crawl-ref/source/art-data.txt
@@ -1251,6 +1251,18 @@ TILE_EQ: kryias
 INSCRIP: DeviceHeal*2
 COLD:    1
 
+ENUM:    FROSTBITE
+NAME:    frozen axe "Frostbite"
+OBJ:     OBJ_WEAPONS/WPN_EXECUTIONERS_AXE
+INSCRIP: freezing cloud,
+PLUS:    +8
+COLOUR:  ETC_ICE
+TILE:    urand_frostbite
+TILE_EQ: frostbite
+BRAND:   SPWPN_FREEZING
+COLD:    1
+BOOL:    skip_ego, fly, noises
+
 # This entry must always be last.
 ENUM:   DUMMY2
 NAME:   DUMMY UNRANDART 2

diff --git a/crawl-ref/source/art-func.h b/crawl-ref/source/art-func.h
@@ -1378,6 +1378,21 @@ static void _KRYIAS_unequip(item_def *item, bool *show_msgs)
 
 ///////////////////////////////////////////////////
 
+static void _FROSTBITE_melee_effects(item_def* weapon, actor* attacker,
+                                    actor* defender, bool mondied, int dam)
+{
+    coord_def spot = defender->pos();
+    if (!mondied
+        && !cell_is_solid(spot)
+        && env.cgrid(spot) == EMPTY_CLOUD
+        && one_chance_in(5))
+    {
+         place_cloud(CLOUD_COLD, spot, random_range(3, 5), attacker, 0);
+    }
+}
+
+///////////////////////////////////////////////////
+
 // Vampiric effect triggers on every hit, see attack::apply_damage_brand()
 
 static void _LEECH_equip(item_def *item, bool *show_msgs, bool unmeld)

diff --git a/crawl-ref/source/dat/database/wpnnoise.txt b/crawl-ref/source/dat/database/wpnnoise.txt
@@ -10,6 +10,7 @@
 
 # Contents:
 # - Shield of the Gong
+# - Frostbite
 # - Noisy randarts
 # - The Singing Sword
 
@@ -38,6 +39,28 @@ BONNNG!
 # scraping hit
 SHROANNG!
 
+###############################################################################
+###############################################################################
+#
+# The FROZEN AXE "FROSTBITE" imitates loud noises from cold environments.
+#
+###############################################################################
+###############################################################################
+
+%%%%
+frozen axe "frostbite"
+
+You hear the [roaring|howling|raging|gusting] winds of a [blizzard|squall|snowstorm].
+
+w:5
+You hear ice [creaking|groaning|grinding|cracking].
+
+w:1
+You hear shards of ice [tinkling|chiming].
+
+w:1
+You hear the [rumble|boom|crash] of [a glacier calving|icebergs colliding].
+
 ###############################################################################
 ###############################################################################
 #

diff --git a/crawl-ref/source/dat/descript/unrand.txt b/crawl-ref/source/dat/descript/unrand.txt
@@ -613,3 +613,8 @@ that kept her alive.
 The wearer of this garment will have significantly increased healing from
 devices.
 %%%%
+frozen axe "Frostbite"
+
+This massive axe looks like it was carved from a glacier, or possibly calved
+from one. It leaves ice crystals in its wake as it swings through the air.
+%%%%
diff --git a/crawl-ref/source/rltiles/dc-player.txt b/crawl-ref/source/rltiles/dc-player.txt
@@ -542,6 +542,7 @@ axe_trog AXE_TROG
 arga ARGA
 demon_axe DEMON_AXE
 axe_of_woe AXE_OF_WOE
+frostbite FROSTBITE
 ## launchers
 blowgun_assassin BLOWGUN_ASSASSIN
 punk PUNK

diff --git a/crawl-ref/source/rltiles/item/weapon/artefact/urand_frostbite.png b/crawl-ref/source/rltiles/item/weapon/artefact/urand_frostbite.png
diff --git a/crawl-ref/source/rltiles/player/hand1/artefact/frostbite.png b/crawl-ref/source/rltiles/player/hand1/artefact/frostbite.png