Pivot implementation and redesign (#69)

- Pivot support implementation 
- Rename queries into inquiries
- Rename editor into workspace
- Change result set format
- New JSON format for inquiries
- Redesign panels

src/store/state.js

@@ -3,6 +3,6 @@ export default {
   currentTab: null,
   currentTabId: null,
   untitledLastIndex: 0,
-  predefinedQueries: [],
+  predefinedInquiries: [],
   db: null
 }