Core: Remove mainwindow.{h,cpp}

Interface was moved to icore.h. The initial worry that lots of code
need changes was apparently unfounded.

Change-Id: I53a494d1ca914c7b1b16500c979029d06f5ab5f6
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/CMakeLists.txt

@@ -213,8 +213,6 @@ add_qtc_plugin(Core
     loggingmanager.h
     loggingviewer.cpp
     loggingviewer.h
-    mainwindow.cpp
-    mainwindow.h
     manhattanstyle.cpp
     manhattanstyle.h
     messagebox.cpp

src/plugins/coreplugin/coreplugin.qbs

@@ -106,8 +106,6 @@ QtcPlugin {
             "loggingmanager.h",
             "loggingviewer.cpp",
             "loggingviewer.h",
-            "mainwindow.cpp",
-            "mainwindow.h",
             "manhattanstyle.cpp",
             "manhattanstyle.h",
             "messagebox.cpp",

src/plugins/coreplugin/mainwindow.h

@@ -1,6 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
-
-#pragma once
-
-#include "icore.h"

src/plugins/coreplugin/modemanager.cpp

@@ -10,7 +10,6 @@
 #include "fancytabwidget.h"
 #include "icore.h"
 #include "imode.h"
-#include "mainwindow.h"
 
 #include <extensionsystem/pluginmanager.h>
 

src/plugins/coreplugin/systemsettings.cpp

@@ -12,7 +12,6 @@
 #include "fileutils.h"
 #include "icore.h"
 #include "iversioncontrol.h"
-#include "mainwindow.h"
 #include "vcsmanager.h"
 
 #include <utils/algorithm.h>