Version control: Replace per-VCS output panes with a single one.

...and give it some color and formatting.

src/plugins/git/gitplugin.h

@@ -30,7 +30,6 @@
 #ifndef GITPLUGIN_H
 #define GITPLUGIN_H
 
-#include "gitoutputwindow.h"
 #include "settingspage.h"
 
 #include <coreplugin/editormanager/ieditorfactory.h>
@@ -94,8 +93,6 @@ public:
 
     QString getWorkingDirectory();
 
-    GitOutputWindow *outputWindow() const;
-
     GitSettings settings() const;
     void setSettings(const GitSettings &s);
 
@@ -165,7 +162,6 @@ private:
 
     ProjectExplorer::ProjectExplorerPlugin *m_projectExplorer;
     GitClient                   *m_gitClient;
-    GitOutputWindow             *m_outputWindow;
     ChangeSelectionDialog       *m_changeSelectionDialog;
     QString                     m_submitRepository;
     QStringList                 m_submitOrigCommitFiles;