Adds open and close sounds for safes. (#82)

* adds the json and sounds.

* reencode sounds

* adds the credits files.

sound/CC-Sounds/close_door/gun_safe/close_safe.json

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+[
+  {
+    "type": "sound_effect",
+    "id": "close_door",
+    "variant": "f_gunsafe_o",
+    "volume": 100,
+    "files": [ "close_door/gun_safe/close_safe.ogg" ]
+  },
+  {
+    "type": "sound_effect",
+    "id": "close_door",
+    "variant": "f_safe_o",
+    "volume": 100,
+    "files": [ "close_door/gun_safe/close_safe.ogg" ]
+  }
+]

sound/CC-Sounds/close_door/gun_safe/credits.md

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+| File Name        | Author   | License   | Link                            |
+|------------------|----------|-----------|---------------------------------|
+| close_safe.ogg | DoctorBoomstick | **CC BY 4.0** | Audio was recorded by myself closing the door of a metal cabinet gunsafe |

sound/CC-Sounds/open_door/gun_safe/credits.md

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+| File Name        | Author   | License   | Link                            |
+|------------------|----------|-----------|---------------------------------|
+| open_safe.ogg | DoctorBoomstick | **CC BY 4.0** | Audio was recorded by myself opening the door of a metal cabinet gunsafe |

sound/CC-Sounds/open_door/gun_safe/open_safe.json

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+[
+  {
+    "type": "sound_effect",
+    "id": "open_door",
+    "variant": "f_gunsafe_c",
+    "volume": 100,
+    "files": [ "open_door/gun_safe/open_safe.ogg" ]
+  },
+  {
+    "type": "sound_effect",
+    "id": "open_door",
+    "variant": "f_safe_c",
+    "volume": 100,
+    "files": [ "open_door/gun_safe/open_safe.ogg" ]
+  }
+]