- Some misc tweaks (#301)

* - Remove molang examples
* - Update has damage because apparently not every value is accepted
* - Add materials enum and adjust entity/attachable accordingly
* - Update damage source list
* - Change to example

---------

Co-authored-by: Daan Verstraten <daanverstraten@hotmail.com>

source/resource/entity/1.8.0/entity.json

@@ -93,7 +93,10 @@
             },
             "materials": {
               "type": "object",
-              "additionalProperties": { "type": "string", "description": "Material reference.", "title": "Material" },
+              "additionalProperties": { 
+                "type": "string", "description": "Material reference.", "title": "Material",
+                "$ref": "../../../general/vanilla/material.json"
+              },
               "description": "A collection of material definitions.",
               "title": "Materials"
             },