CMake: Fix includes all over the CMake plugin

Keep internals internal, remove some unnecessary includes, add
some that should have been there.

This reduces the number of files that get rebuild when working
on CMake internals from over 1000 to about 200.

This patch also moves some code around that ended up being
in the wrong file.

Change-Id: Icd7366ac760dc85031040720418fbb16336dce9b
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp

@@ -24,20 +24,17 @@
 ****************************************************************************/
 
 #include "cmakeprojectmanager.h"
-#include "cmakebuildconfiguration.h"
+
+#include "cmakebuildsystem.h"
 #include "cmakekitinformation.h"
-#include "cmakeprojectconstants.h"
 #include "cmakeproject.h"
-#include "cmakesettingspage.h"
-#include "cmaketoolmanager.h"
+#include "cmakeprojectconstants.h"
 #include "cmakeprojectnodes.h"
 
 #include <coreplugin/actionmanager/actioncontainer.h>
 #include <coreplugin/actionmanager/actionmanager.h>
-#include <coreplugin/actionmanager/command.h>
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/editormanager/ieditor.h>
-#include <coreplugin/icore.h>
 #include <coreplugin/messagemanager.h>
 #include <projectexplorer/buildmanager.h>
 #include <projectexplorer/projectexplorer.h>
@@ -49,8 +46,6 @@
 #include <utils/parameteraction.h>
 
 #include <QAction>
-#include <QDateTime>
-#include <QIcon>
 
 using namespace ProjectExplorer;
 using namespace CMakeProjectManager::Internal;