Third-person hold stance is now consistent with first-person (held with 2 hands), to match Gmod update

Mercy gun now deals 24 down from 30 damage a shot by default, which only affects servers that have never installed this mod before.

Updated url for downloading TFA base

- Fixed reaper shotguns glowing on maps with bad cubemaps
- Disabled auto-switching when picking up a new overwatch gun while holding one

- Fixed sombra smg pulling its damage value from its clip size rather than its damage convar making it deal wayyy more damage than intended

- Fixed Sombra's SMG damage convar not doing anything

Added convars

Changed TFA inspect key to not conflict with the buy menu button, hopefully fixed bullets being untextured

Buffed all guns more

Added chat notification if the required base mod isn't installed to download the base mod

Re-balanced guns