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/general/size.json

@@ -34,13 +34,11 @@
       "items": [
         {
           "title": "Width",
-          "type": "string",
           "description": "A variable",
           "$ref": "#/definitions/size_coord"
         },
         {
           "title": "Height",
-          "type": "string",
           "description": "A variable",
           "$ref": "#/definitions/size_coord"
         }