Misc improvements (#347)

* - Allow for items without namespaces in loot tables

* - Made rolls in loot table required

* - Account for match tag conditions by not requiring item and count

* - Allow forward / in feature (and rule) identifers

* - Added pattern for structure names

* - Change atlas > texture_name to const

* - Allow . in texture entries in atlas files

* - Food nutrition can only be ints

source/behavior/loot_tables/conditions/match_tool.json

@@ -4,7 +4,7 @@
     "additionalProperties": false,
     "description": "Returns the condition true if the block of the loot table was broken with a specific item.",
     "title": "Killed By Player",
-  "required": ["condition", "item", "count"],
+  "required": ["condition"],
     "properties": {
       "condition": { "type": "string",  "const": "match_tool", "title": "Condition", "description": "UNDOCUMENTED.", "$comment": "UNDOCUMENTED" },
       "item": {