Client: implement spectator mode via command-line options

If running with --spectate/-s CPlayerInterface will appear even without human players.
Following command-line options also available:
 --spectate-ignore-hero
 --spectate-hero-speed=N
 --spectate-battle-speed=N
 --spectate-skip-battle
 --spectate-skip-battle-result
Boolean options can also be changed in runtime via client console:
 set spectate-ignore-hero on / off
Spectator mode also:
 - Work with --onlyAI option when starting game or loading saves.
 - Allow to use any cheat codes.
 - Give recon on towns and heroes.

client/windows/InfoWindows.cpp

@@ -335,6 +335,8 @@ void CRClickPopup::close()
 void CRClickPopup::createAndPush(const std::string &txt, const CInfoWindow::TCompsInfo &comps)
 {
 	PlayerColor player = LOCPLINT ? LOCPLINT->playerID : PlayerColor(1); //if no player, then use blue
+	if(settings["session"]["spectate"].Bool())//TODO: there must be better way to implement this
+		player = PlayerColor(1);
 
 	CSimpleWindow * temp = new CInfoWindow(txt, player, comps);
 	temp->center(Point(GH.current->motion)); //center on mouse