Fix some more "unused" warnings
qhexedit: Add ability to highlight similar bytes

This will be useful in recognizing patterns.
nandseewindow: Add same-byte highlighting

Take advantage of the newly-added same-byte highlighting present in
the hex view.
event: Correctly decode read column/row address

We now correctly decode both the row and the column address.
Unfortunately, we can't decode the entirety of the "row" address,
which consists of LUN, block, and page addresses, as we don't know
how many LUNs or blocks this part has.