Add new type sv_alltalk 5

[wopox1337]

Close #643

// When players can hear each other.
// Further explanation: https://github.com/s1lentq/ReGameDLL_CS/wiki/sv_alltalk
// 0 - dead don't hear alive
// 1 - no restrictions
// 2 - teammates hear each other
// 3 - same as 2, but spectators hear everybody
// 4 - alive hear alive, dead hear dead and alive.
// 5 - alive hear alive teammates, dead hear dead and alive.
//
// Default value: "0"
sv_alltalk 0

Thanks kanagava for this request.

[Vaqtincha]

alive hear dead teammate, dead hear alive enemy, spec hear alive & dead, dead hear spec, alive hear spec, dead 😕