Implement ProtocolTemplateEditor

Summary

This merge request implements the editor for the ProtocolTemplate asset

Relevant issue(s) fixed

Fixes #210 (closed)

beat/editor/backend/assetmodel.py

@@ -247,3 +247,14 @@ class AssetModel(QStringListModel):
         """Returns the folder matching this model asset type"""
 
         return os.path.join(self.prefix_path, AssetType.path(self.asset_type))
+
+    def json_path(self, asset_name):
+        """Returns the full path to the json file matching the asset given
+
+        :param asset_name str: fully qualified asset name
+        """
+
+        asset_path = os.path.join(self.asset_folder, "{}.json".format(asset_name))
+        if not os.path.exists(asset_path):
+            raise RuntimeError("Invalid asset {}".format(asset_name))
+        return asset_path