add extra action for interrupting with Ctrl-C (bug #44204) * QTerminal.cc (notice_settings): check if copy-shortcut is Ctrl-C and set flag for slots and enable/disable new interrupt-action accordingly * QTerminal.h: new function setting flag (purely virtual); (constructor): new interrupt-action with shortcut Ctrl-C * QUnixTerminalImpl.cpp (copyClipboard): call internal function with flag; (has_extra_interrupt): new function for setting flag for copy-/interrupt- slots * QUnixTerminalImpl.h new flag for slots and function setting flag * TerminalView.cpp (copyClipboard): gets flag as parameter, only interrupts if Ctrl-C is shortcut for copy * TerminalView.h: copyClipboard with boolean parameter * QWinTerminalImpl.cpp (copyClipboard): only interrupts if Ctrl-C is shortcut for copy; (has_extra_interrupt): function for setting flag for copy-/interrupts-slots * QWinTerminalImpl.h: new flag and function setting the flag

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