Body Search - Add convar to force covert searching

[Malivil]

Requester wants to make it so players have to press the confirm death button to share info.

• Add convar
  • Update search logic
  • Update tooltip logic to never show covert tip
• ULX
• CONVARS.md

[Malivil]

Completed by 6bb0696 and Custom-Roles-for-TTT/TTT-Custom-Roles-ULX#132