feat(ui): support shift+tab for going to the previous tab #70
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Description of change
Implemented Shift+Tab for scrolling a tab back
Closes #63
Concerns
if else
's inHexdumpCommand#parse
to amatch
ShiftTab -> Back
takes up a lot of space and might be a weird nameCancelPrevious
doesn't really need acheck_sub
since Hexdump is not the first tab