[TF2] Implement unused teleporter activation sound for MvM#1953

CookieCat45 wants to merge 2 commits into

ValveSoftware:masterValveSoftware/source-sdk-2013:masterfrom

CookieCat45:mvm-tele-startsoundCookieCat45/source-sdk-2013:mvm-tele-startsoundCopy head branch name to clipboard