add mods as a lobby-level setting instead of being bound to a single playlist item

[ILW8]

it goes against the idea of a playlist, but for the purposes of a tournament match, it makes more sense to set mods at a lobby level. There has been issues where a !mp mods command comes too close right after !mp map such that the mods get lost.

Settings mods as a lobby-level setting would allow intercepting new playlist items and adding the requisite mods