Make command history reversed

[timcanham]

F´ Version	2.0
Affected Component	None

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Feature Description

When a command is sent, it is added to the end of the command history. Reverse this, and add commands to the beginning.

Rationale

If you frequently reuse commands, clicking on the one in the list can mean scrolling down through many commands. This was how the old GUI worked, and it was handy during testing.

Bonus: If the same command with the same arguments is already on the end of the list, don't add it.