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/Source/GemCatalog/GemCatalogScreen.cpp

@@ -12,7 +12,6 @@
 
 #include <GemCatalog/GemCatalogScreen.h>
 #include <PythonBindingsInterface.h>
-#include <GemCatalog/GemCatalogHeaderWidget.h>
 #include <GemCatalog/GemListHeaderWidget.h>
 #include <GemCatalog/GemSortFilterProxyModel.h>
 #include <QVBoxLayout>
@@ -35,8 +34,8 @@ namespace O3DE::ProjectManager
         vLayout->setSpacing(0);
         setLayout(vLayout);
 
-        GemCatalogHeaderWidget* headerWidget = new GemCatalogHeaderWidget(m_proxModel);
-        vLayout->addWidget(headerWidget);
+        m_headerWidget = new GemCatalogHeaderWidget(m_gemModel, m_proxModel);
+        vLayout->addWidget(m_headerWidget);
 
         QHBoxLayout* hLayout = new QHBoxLayout();
         hLayout->setMargin(0);
@@ -77,10 +76,11 @@ namespace O3DE::ProjectManager
             m_filterWidget->deleteLater();
         }
 
+        m_proxModel->ResetFilters();
         m_filterWidget = new GemFilterWidget(m_proxModel);
         m_filterWidgetLayout->addWidget(m_filterWidget);
 
-        m_proxModel->InvalidateFilter();
+        m_headerWidget->ReinitForProject();
 
         // Select the first entry after everything got correctly sized
         QTimer::singleShot(200, [=]{