Fix Edit Title, Duplicate Title shortcut overlap with Add Track #3312
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A user reported that the Duplicate Title shortcut both (a) didn't work, and (b) wasn't editable. Turned out, it was set to Ctrl+Shift+T, which is a problem because so was Edit Title. Worse, neither of those actually responded to Ctrl+Shift+T, because Ctrl+Shift+T is Add Track! They also appeared nowhere in the settings file.
I managed to fix that, made them both configurable, with Duplicate Track set to Ctrl+Shift+C — it was free — and Edit Title not set by default.
As part of making the shortcuts properly react to selection in the file views, I rewrote a bunch of the selection-handling logic so it's less easily confused, and accidentally fixed #3240 in the process.
Fixes #3310
Fixes #3240