Update: (license) Replace with MIT Headers

MIT license requires MIT headers.

src/AnticheatMgr.h

@@ -1,16 +1,25 @@
 /*
- * 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 2 of the License, or (at your
- * option) any later version.
+ *MIT License
  *
- * 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.
+ *Copyright (c) 2022 Azerothcore
  *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *Permission is hereby granted, free of charge, to any person obtaining a copy
+ *of this software and associated documentation files (the "Software"), to deal
+ *in the Software without restriction, including without limitation the rights
+ *to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *copies of the Software, and to permit persons to whom the Software is
+ *furnished to do so, subject to the following conditions:
+ *
+ *The above copyright notice and this permission notice shall be included in all
+ *copies or substantial portions of the Software.
+ *
+ *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *SOFTWARE.
  */
 
 #ifndef SC_ACMGR_H