Impersonator - Add convar to have traitors corpses show as equivalent innocent role

[Malivil]

• [ ] Add ConVar to fake the revealed role
  • [ ] Have different button to switch to other mode (real or fake depending on what client setting value is)
  • [ ] Create UI to show what role they will switch to if that button is pressed
• [ ] Add ConVar to allow non-traitors to reveal real role
• [ ] Documentation
• [ ] ULX

[Malivil]

Superseded by https://github.com/NoxxFlame/TTT-Custom-Roles/issues/238