GemCatalog: Gem cart widget and overlay window

* [LYN-4174] Added icons for gem catalog summary cart

* [LYN-4174] Gem Catalog: Text eliding for too long gem names and creators

* [LYN-4174] Gem catalog: Resetting filters when re-initializing for another project

* [LYN-4174] Gem Catalog: Fixed a bug with filters being applied/remembered after leaving gem catalog and coming back editing another project

* [LYN-4174] GemCatalog: Gem cart widget and overlay window

* Added cart button with dynamic label to display the number of gems to be enabled/disabled and a arrow down button to indicate some sort of pop-up/overlay window will appear on click.
* Overlay gem tags update dynamically while the dialog is open based on the gem model.
* Moved some styling from C++ to the style sheet.

Code/Tools/ProjectManager/Resources/ProjectManager.qrc

@@ -26,5 +26,8 @@
         <file>Backgrounds/FirstTimeBackgroundImage.jpg</file>
         <file>ArrowDownLine.svg</file>
         <file>ArrowUpLine.svg</file>
+        <file>CarrotArrowDown.svg</file>
+        <file>Summary.svg</file>
+        <file>WindowClose.svg</file>
     </qresource>
 </RCC>