Added elephant & ankheg models

Added elephant & ankheg models & portraits  Imported pnp creature UTCs over from NWNDS for ankhegs, air elementals, scorpions, cheetahs & invisible stalkers. Setup burrower AI or testing.  Full compile.

_module/are/beholdercave.are.json

@@ -14,7 +14,7 @@
   },
   "Comments": {
     "type": "cexostring",
-    "value": "Beholder Cave"
+    "value": "Dragonmarsh Lowlands: Cazrak's Cave"
   },
   "Creator_ID": {
     "type": "int",
@@ -87,7 +87,7 @@
   "Name": {
     "type": "cexolocstring",
     "value": {
-      "0": "Beholder Cave"
+      "0": "Dragonmarsh Lowlands: Cazrak's Cave"
     }
   },
   "NoRest": {
@@ -148,7 +148,7 @@
   },
   "Tag": {
     "type": "cexostring",
-    "value": "BeholderCave"
+    "value": "DML_CAZRAKS_CAVE"
   },
   "Tile_List": {
     "type": "list",
@@ -2913,7 +2913,7 @@
   },
   "Version": {
     "type": "dword",
-    "value": 15
+    "value": 16
   },
   "Width": {
     "type": "int",