Add <leftCmdOn>, <leftCmdOff> keys for macOS guests

[mcandre]

FOR FEATURES:

Packer currently does not provide a convenient way to signal to a VM that the Command key should be held down or let go. Please add <leftCmdOn>, <leftCmdOff> so that important macOS guest hotkeys can be typed into VM's.

[rickard-von-essen]

This key is called L_GUI/R_GUI in keyboard nomenclature.

[kikitux]

being worked on PR, closing this issue.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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