Fixes: Add a settings page to the cmake plugin.

Details:  There's a linedit on there, we restore and save the settings,
only thing missing is actually using it.

src/plugins/projectexplorer/environment.cpp

@@ -183,10 +183,6 @@ void Environment::clear()
     m_values.clear();
 }
 
-// currently it returns the string that was passed in, except
-// under windows and if the executable does not end in .exe
-// then it returns executable appended with .exe
-// that is clearly wrong
 QString Environment::searchInPath(QString executable)
 {
 //    qDebug()<<"looking for "<<executable<< "in PATH: "<<m_values.value("PATH");