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/main_gui.cpp

@@ -33,6 +33,7 @@
 #include "guitimer_func.h"
 #include "error.h"
 #include "news_gui.h"
+#include "misc_cmd.h"
 
 #include "saveload/saveload.h"
 
@@ -326,7 +327,7 @@ struct MainWindow : Window
 
 			case GHK_MONEY: // Gimme money
 				/* You can only cheat for money in singleplayer mode. */
-				if (!_networking) DoCommandP(CMD_MONEY_CHEAT, 0, 10000000, 0);
+				if (!_networking) Command<CMD_MONEY_CHEAT>::Post(0, 10000000, 0, {});
 				break;
 
 			case GHK_UPDATE_COORDS: // Update the coordinates of all station signs