Added GNU Public License and fixed bugs

- Fixed a bug in which the client would fail to load GLMVS due to lua
files loading incorrectly, had to recode the addon a bit more and caused
an unexpected result...
- Added the GNU General Public License v3, so nobody can claim they did
this.

Update GLMVS and it should work fine, adding maps still have the same
way of adding them. Nothing has changed for adding, might polish this
later.