On Mac right clicks can only be executed trough Ctrl+Click (without using a mouse).
This patch adds an option under the general tab of the options menu called "Mac Mouse". When enabled the config value "macmouse" is set to true, as a result right-clicking with Ctrl+Click can be done.
As this conflicts with other actions in the game that use Ctrl+Click, those are changed to CMD+Click.
A restart is required when changing the option as the function UseMacOSXHotkeysis called from gamesetup.cpp. I sadly couldn't bring it to work without a restart.