CMake: Write creators settings into build directory

Write a file qtcsettings.cmake into the build directory. This
file contains all applicable CMake configuration settings that
creator wants to set.

Use "cmake -C qtcsettings.cmake .." to reconfigure on the command
line to make use of this file.

Change-Id: I4a69d082c50bb66e60b4eec1b3155df53e00734d
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/cmakeprojectmanager/cmakeprocess.cpp

@@ -84,13 +84,6 @@ CMakeProcess::~CMakeProcess()
     }
 }
 
-QStringList CMakeProcess::toArguments(const CMakeConfig &config,
-                                      const Utils::MacroExpander *expander) {
-    return Utils::transform(config, [expander](const CMakeConfigItem &i) -> QString {
-        return i.toArgument(expander);
-    });
-}
-
 void CMakeProcess::run(const BuildDirParameters &parameters, const QStringList &arguments)
 {
     QTC_ASSERT(!m_process && !m_parser && !m_future, return);