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/cheat_gui.cpp

@@ -28,6 +28,7 @@
 #include "tile_map.h"
 #include "newgrf.h"
 #include "error.h"
+#include "misc_cmd.h"
 
 #include "widgets/cheat_widget.h"
 
@@ -54,7 +55,7 @@ static int32 _money_cheat_amount = 10000000;
  */
 static int32 ClickMoneyCheat(int32 p1, int32 p2)
 {
-	DoCommandP(CMD_MONEY_CHEAT, 0, (uint32)(p2 * _money_cheat_amount), 0);
+	Command<CMD_MONEY_CHEAT>::Post(0, (uint32)(p2 * _money_cheat_amount), 0, {});
 	return _money_cheat_amount;
 }