update banner configuration https://github.com/HarpyWar/pvpgn/issues/115
fix compile error in Linux https://travis-ci.org/HarpyWar/pvpgn/builds/39961428 https://github.com/HarpyWar/pvpgn/issues/115
Update CMakeLists.txt https://github.com/HarpyWar/pvpgn/issues/115
Merge pull request #117 from iltmpz/master

fix encoding for W2BN, should be cp1251 instead of UTF-8
fix russian encoding (in addition to https://github.com/HarpyWar/pvpgn/pull/117)
fix `next_id` assignment when loading ad.conf  https://github.com/HarpyWar/pvpgn/issues/115
cleanup code
fix possible memory leak, because key_get_tab return xstrdup (?)