Infrastructure and changes to the Query Tool for realtime preference handling. Refs #3294

Highlights of this patch include:
- Changes will affect SQL Editors in Create dialog boxes, SQL tab of the main screen, Query tool, History entries in the query tool, Query tool opened in New Tab/Window
- All the components of SQL editor will refer to single source of preferences which is cached in the Browser object. All other redundant ajax get preference calls are removed.
- SQL editor will not refer template JS variables anymore, once all the references are removed the template variables will also be removed.
- Code refactoring wherever possible.
- Covered JS test cases wherever possible.

web/regression/javascript/sqleditor_utils_spec.js

@@ -28,5 +28,13 @@ function (SqlEditorUtils) {
         expect(SqlEditorUtils.capitalizeFirstLetter('create script')).toEqual('Create script');
       });
     });
+
+    describe('Calculate font size of input number passed', function () {
+      it('calcFontSize', function () {
+        expect(SqlEditorUtils.calcFontSize(1.456)).toEqual('1.46em');
+        expect(SqlEditorUtils.calcFontSize()).toEqual('0em');
+        expect(SqlEditorUtils.calcFontSize(2)).toEqual('2em');
+      });
+    });
   });
 });