[New Feature] Allow the left and right mouse buttons to be swapped.

[CCHyper]

First Check

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Description

Modern RTS games (such as C&C3, Starcraft 2, etc) switch the mouse button actions so that the left button cancels input and the right button is used for issuing commands and actions. Adding an option to switch the mouse buttons to the in-game options dialog would allow the end-user to control this depending on their preference.

Proposed Code (optional)

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Additional Context

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