files in menu directory need ZetaGlest header

[andy5995]

The source code files in this directory need the header replaced

https://github.com/ZetaGlest/zetaglest-source/tree/develop/source/glest_game/menu

Some of the files already have a ZetaGlest header. Just skip those.

This is the old header:

// ==============================================================
//      This file is part of Glest (www.glest.org)
//
//      Copyright (C) 2001-2008 Martiño Figueroa
//
//      You can redistribute this code and/or modify it under
//      the terms of the GNU General Public License as published
//      by the Free Software Foundation; either version 2 of the
//      License, or (at your option) any later version
// ==============================================================

This is the new one. For each file, be sure to change the filename at the top line.

//
//      filename.cpp/h:
//
//      This file is part of ZetaGlest <https://github.com/ZetaGlest>
//
//      Copyright (C) 2018  The ZetaGlest team
//
//      ZetaGlest is a fork of MegaGlest <https://megaglest.org>
//
//      This program is free software: you can redistribute it and/or modify
//      it under the terms of the GNU General Public License as published by
//      the Free Software Foundation, either version 3 of the License, or
//      (at your option) any later version.
//
//      This program is distributed in the hope that it will be useful,
//      but WITHOUT ANY WARRANTY; without even the implied warranty of
//      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//      GNU General Public License for more details.
//
//      You should have received a copy of the GNU General Public License
//      along with this program.  If not, see <https://www.gnu.org/licenses/>```

[ronsailer]

On it :)

[andy5995]

ok @ronsailer .

[ronsailer]

@andy5995 Please review #253