License of library_extension, extruded from defense mod and commented by NetherEran
======================
Copyright Ⓒ 2015 Lean Rada.
Copyright (c) 2019 NetherEran

License of source code
----------------------
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 <http://www.gnu.org/licenses/>.

License of media (models, textures, music, sounds, everything else)
-------------------------------------------------------------------
Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)                                 
http://creativecommons.org/licenses/by-sa/3.0/
