[LYN-2515] Project Manager Gem List (#642)

* [LYN-2515] Project Manager Gem List Base

* Added gem model based on a standard item model
* Added list view using the gem model
* Added item delegate for a gem according to the UX design
* Removed th gem catalog ui file and replaced it with code
* Moved the gem catalog files into a sub folder
* Added drawing the Added/Get button and the platform icons

Code/Tools/ProjectManager/project_manager.qrc

@@ -1,8 +1,13 @@
-<!DOCTYPE RCC><RCC version="1.0">
-    <qresource>
+<RCC>
+    <qresource prefix="/">
         <file>Resources/ProjectManager.qss</file>
         <file>Resources/Add.svg</file>
         <file>Resources/Select_Folder.svg</file>
         <file>Resources/o3de_editor.ico</file>
+        <file>Resources/Windows.svg</file>
+        <file>Resources/Android.svg</file>
+        <file>Resources/iOS.svg</file>
+        <file>Resources/Linux.svg</file>
+        <file>Resources/macOS.svg</file>
     </qresource>
-</RCC>
+</RCC>