Core/Code: Unify codestyle for brackets: {} to { }.

Also added missing copyright to some files.
Core/Code: Adding copyright to all the mesh_extractor files.
Merge pull request #11138 from Ascathor/master

Core/Code: Unify codestyle for brackets: {} to { }.
Core/Code: Unify [more] codestyle for brackets: )\n{\n} to ) { }.
Merge pull request #11147 from LeGuybrush/master

Core/Code: Unify [more] codestyle for brackets: )\n{\n} to ) { }.
Core/Vehicles: Add missing NULL check in cf72f7cc5cf13607dd7353b8d940d56679b6956b

Add an additional NULL check for me->GetVehicleKit() , otherwise the crash fixed in cf72f7cc5cf13607dd7353b8d940d56679b6956b becomes a NULL dereference crash.
Merge https://github.com/TrinityCore/TrinityCore