Add a comand line editor for environment variables

Task-number: QTCREATORBUG-6499

Change-Id: I43df7bddd10776e0fdb192c668ab0d99a6fea7e6
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>
Reviewed-by: hjk <qthjk@ovi.com>

src/libs/utils/environment.h

@@ -58,6 +58,7 @@ public:
         return unset == other.unset && name == other.name && value == other.value;
     }
 
+    static void sort(QList<EnvironmentItem> *list);
     static QList<EnvironmentItem> fromStringList(const QStringList &list);
     static QStringList toStringList(const QList<EnvironmentItem> &list);
 };