* refactor: add StatsMode to libtransmission-app
* test: add display-mode unit tests
* feat: add apicompat for StatsMode
* refactor: use StatsMode in Qt client
* refactor: add template method for gtr_set_pref()
* refactor: use StatsMode in GTK client
* ci: use the all-tests alias instead of hardcoding tests
* ci: copy runtime DLLS into test output directory for Windows test binaries
* refactor: replace should_convert_child_strings() with a State.path stack
* refactor: de-intern the TR_KEY_sort_ keys
* refactor: de-intern the TR_KEY_show_ keys
* refactor: add libtransmission-app
* refactor: add libtransmission-app/display-modes.h
* refactor: use app::SortMode, app:ShowMode in Qt client
* feat: add to_variant(), to_value() in serializer
* refactor: use app::SortMode in GTK client
* refactor: use app::ShowMode in GTK client
* refactor: make naming consistent with libtransmission-app