Codechange: Template DoCommandP to automagically reflect the parameters of the command proc.

When finished, this will allow each command handler to take individually
different parameters, obliviating the need for bit-packing.

src/company_cmd.cpp

@@ -604,7 +604,7 @@ static bool MaybeStartNewCompany()
 	if (n < (uint)_settings_game.difficulty.max_no_competitors) {
 		/* Send a command to all clients to start up a new AI.
 		 * Works fine for Multiplayer and Singleplayer */
-		return DoCommandP(CMD_COMPANY_CTRL, 0, CCA_NEW_AI | INVALID_COMPANY << 16, 0);
+		return Command<CMD_COMPANY_CTRL>::Post(0, CCA_NEW_AI | INVALID_COMPANY << 16, 0, {});
 	}
 
 	return false;