AtomTools: fixing status bar messages

fixed problems with status bar messages not appearing
added status bar messages to shader management console
got rid of central widget variable and moved layout to atom tools window base class

Signed-off-by: Guthrie Adams <guthadam@amazon.com>

Gems/Atom/Tools/AtomToolsFramework/Code/Include/AtomToolsFramework/Window/AtomToolsMainWindow.h

@@ -16,8 +16,8 @@
 #include <AzQtComponents/Components/StyledDockWidget.h>
 #include <AzQtComponents/Components/Widgets/TabWidget.h>
 
+#include <QLabel>
 #include <QMenuBar>
-#include <QStatusBar>
 #include <QToolBar>
 
 namespace AtomToolsFramework
@@ -53,10 +53,9 @@ namespace AtomToolsFramework
         virtual void SelectNextTab();
 
         AzQtComponents::FancyDocking* m_advancedDockManager = nullptr;
-        QWidget* m_centralWidget = nullptr;
         QMenuBar* m_menuBar = nullptr;
         AzQtComponents::TabWidget* m_tabWidget = nullptr;
-        QStatusBar* m_statusBar = nullptr;
+        QLabel* m_statusMessage = nullptr;
 
         AZStd::unordered_map<AZStd::string, AzQtComponents::StyledDockWidget*> m_dockWidgets;
     };