Commit 5e5969a0 authored by Gaël Bonithon's avatar Gaël Bonithon

Add command line option and setting for file opening mode

This adds a `--opening-mode` command line option with three modes:
* "tab": open files in new tabs in the last active window if any, or
  in a new window;
* "window": open files in new windows;
* "mixed": open files in new tabs in a new window (previous behavior).

The default is "tab" and can be changed in the preferences dialog.

Closes #14, see !41 for more details.
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