Improvement in the look and feel of the whole application

Changed the SCSS/CSS for the below third party libraries to adopt the
new look 'n' feel:
- wcDocker
- Alertify dialogs, and notifications
- AciTree
- Bootstrap Navbar
- Bootstrap Tabs
- Bootstrap Drop-Down menu
- Backgrid
- Select2

Adopated the new the look 'n' feel for the dialogs, wizard, properties,
tab panels, tabs, fieldset, subnode control, spinner control, HTML
table, and other form controls.

- Font is changed to Roboto
- Using SCSS variables to define the look 'n' feel
- Designer background images for the Login, and Forget password pages in
  'web' mode
- Improved the look 'n' feel for the key selection in the preferences
  dialog
- Table classes consistency changes across the application
- File Open and Save dialog list view changes

Author(s): Aditya Toshniwal & Khushboo Vashi

web/pgadmin/tools/debugger/static/css/debugger.css

@@ -1,10 +1,3 @@
-#container {
-  position: absolute;
-  top: 40px;
-  bottom: 0px;
-  left: 0px;
-  right: 0px;
-}
 
 .full-container {
   position: absolute;
@@ -29,29 +22,4 @@
   width: 100%;
   position: absolute;
   top: 0; bottom: 0; right: 0; left: 0;
-}
-
-.debugger-container .breakpoints {
-  width: 0.9em;
-}
-
-.CodeMirror, .CodeMirror-gutters {
-  min-height: 100%;
-}
-
-.CodeMirror-foldgutter {
-  width: .9em;
-}
-
-.CodeMirror-foldgutter-open,
-.CodeMirror-foldgutter-folded {
-  cursor: pointer;
-}
-
-.CodeMirror-foldgutter-open:after {
-  content: "\25BC";
-}
-
-.CodeMirror-foldgutter-folded:after {
-  content: "\25B6";
-}
+}