Add: humans can have horns now (#276)

* Change stuff

* Change more stuff

* Horns look bad on slimes (sad)

* Gotcha boss

Resources/Locale/ru-RU/_stories/markings/horns.ftl

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+marking-HumanHornsShort = Короткие рожки
+marking-HumanHornsSimple = Рожки

Resources/Prototypes/Stories/Entities/Mobs/Customization/Markings/horns.yml

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+- type: marking
+  id: HumanHornsShort
+  bodyPart: HeadTop
+  markingCategory: HeadTop
+  speciesRestriction: [Human]
+  sprites:
+  - sprite: Stories/Mobs/Customization/horns.rsi
+    state: horns_short
+
+- type: marking
+  id: HumanHornsSimple
+  bodyPart: HeadTop
+  markingCategory: HeadTop
+  speciesRestriction: [Human]
+  sprites:
+  - sprite: Stories/Mobs/Customization/horns.rsi
+    state: horns_simple

Resources/Textures/Stories/Mobs/Customization/horns.rsi/meta.json

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+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "https://github.com/Skyrat-SS13/Skyrat-tg/tree/40e3cdbb15b8bc0d5ef2fb46133adf805bda5297, while Argali, Ayrshire, Myrsore, Bighorn and Demonic are drawn by Ubaser, and Kobold Ears are drawn by Pigeonpeas. Body_underbelly made by Nairod(github) for SS14. Large drawn by Ubaser. Wagging tail by SonicDC. Splotch modified from Sharp by KittenColony(github). Frills neckfull come from: https://github.com/Bubberstation/Bubberstation/commit/8bc6b83404803466a560b694bf22ef3c0ac266a2",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+
+    {
+      "name": "horns_simple",
+      "directions": 4
+    },
+    {
+      "name": "horns_short",
+      "directions": 4
+    }
+  ]
+}