Add Initial Gem Repository Management Screen (#4172)

* Adds the gem repo screen with the UI built but with mocked data and not connected to the o3de scripts

Signed-off-by: nggieber <nggieber@amazon.com>

* Changed name of added to enabled, disabled define, removed unused functions

Signed-off-by: nggieber <nggieber@amazon.com>

* Added eof nl to qss

Signed-off-by: nggieber <nggieber@amazon.com>

Code/Tools/ProjectManager/Source/EngineSettingsScreen.cpp

@@ -7,15 +7,16 @@
  */
 
 #include <EngineSettingsScreen.h>
-#include <QVBoxLayout>
-#include <QLabel>
-#include <QLineEdit>
-#include <QMessageBox>
 #include <FormLineEditWidget.h>
 #include <FormFolderBrowseEditWidget.h>
 #include <PythonBindingsInterface.h>
 #include <PathValidator.h>
 
+#include <QVBoxLayout>
+#include <QLabel>
+#include <QLineEdit>
+#include <QMessageBox>
+
 namespace O3DE::ProjectManager
 {
     EngineSettingsScreen::EngineSettingsScreen(QWidget* parent)
@@ -78,16 +79,6 @@ namespace O3DE::ProjectManager
         return ProjectManagerScreen::EngineSettings;
     }
 
-    QString EngineSettingsScreen::GetTabText()
-    {
-        return tr("Engine");
-    }
-
-    bool EngineSettingsScreen::IsTab()
-    {
-        return true;
-    }
-
     void EngineSettingsScreen::OnTextChanged()
     {
         // save engine settings