Fill in some undocumented entries (#356)

* Add permutations description

* Adjust grammar

* Update description of "num_mip_levels"

* Update "atlas_tile" and "blend_frames" property

Some properties had completely incorrect titles as well, those were fixed in this commit too.

* Update JSON UI schema

* Update item schema

* Update terrain_texture schema

* Update animations schema

* Update go_home.json

* Update textures schemas

source/resource/ui/elements/properties/font_size.json

@@ -3,7 +3,7 @@
   "description": "The size of the font.",
   "anyOf": [
     {
-      "enum": ["normal"]
+      "enum": [ "small", "normal", "large", "extra_large" ]
     },
     {
       "$ref": "../../general/item_ref.json"