qt: Copy passphrase without separators to clipboard
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qt: Copy passphrase without separators to clipboard

* qt/pinlineedit.cpp, qt/pinlineedit.h (PinLineEdit::copy,
PinLineEdit::cut): New.
* qt/pinlineedit.cpp (PinLineEdit::Private::copyToClipboard): New.
(PinLineEdit::keyPressEvent): Handle more key sequences.

This makes sure that passphrase is copied without formatting separators
to the clipboard. Copying the selection made with the mouse to the
selection clipboard is not handled because the behavior of QLineEdit
on mouse release cannot be modified easily.