Memory manipulation

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Users should be able to manipulate target memories via the memory inspection pane and the snapshot viewer.

'Fill' function

Via the memory inspection pane, users should be able to select any number of bytes, and fill them with any given value. This function should be available via the context menu of the selected bytes.

'Restore' function

With a memory snapshot, users should be able to restore an entire snapshot to the target's memory. They should also be able to restore individual bytes, by selecting them and choosing the 'Restore' action in the context menu.

More to follow.

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The snapshot restore function was implemented at part of #46.