extract xges adapter files (#1538)

* extract xges adapter files

Signed-off-by: rosborne132 <[email protected]>

Author: rosborne132

contrib/opentimelineio_contrib/adapters/contrib_adapters.plugin_manifest.json

@@ -1,18 +1,5 @@
 {
     "OTIO_SCHEMA" : "PluginManifest.1",
-    "adapters": [
-        {
-            "OTIO_SCHEMA": "Adapter.1",
-            "name": "xges",
-            "filepath": "xges.py",
-            "suffixes": ["xges"]
-        }
-    ],
-    "schemadefs" : [
-        {
-            "OTIO_SCHEMA" : "SchemaDef.1",
-            "name" : "xges",
-            "filepath" : "xges.py"
-        }
-    ]
+    "adapters": [],
+    "schemadefs" : []
 }