Helper Command

- Added _query helper command for script writers, which accepts a filter like
  any other report, but returns raw JSON.

src/main.h

@@ -68,6 +68,7 @@ int handleCompletionIDs (std::string&);
 int handleCompletionConfig (std::string&);
 int handleCompletionVersion (std::string&);
 int handleUrgency (std::string&);
+int handleQuery (std::string&);
 int handleVersion (std::string&);
 int handleConfig (std::string&);
 int handleShow (std::string&);