Players may disable tv_delaymapchange_protect when people are spectating through STV

[ldesgoui]

• warn that people are watching
• automatically change the map when it is safe to do so

[sapphonie]

partially implemented here (does not check if players are actually connected to stv) for reference, might put in a PR myself honestly

[sapphonie]

This could be implemented with SourceTVManager by PeaceMaker

if (SourceTV_GetSpectatorCount() > 0)
{
    // etc.
}

public void SourceTV_OnStopRecording(int instance, const char[] filename, int recordingtick)
{
    // etc.
}