Rework how properties dialogs are handled #1050

Annotations

10 warnings

'=': conversion from '_Ty' to '_Ty', signed/unsigned mismatch

'=': conversion from '_Ty' to 'wchar_t', signed/unsigned mismatch

'tremotesf::TorrentDownloadDirectoryDirectorySelectionWidgetViewModel': default constructor was implicitly defined as deleted

'=': conversion from '_Ty' to 'wchar_t', signed/unsigned mismatch

'initializing': conversion from 'const _Ty' to '_Ty', signed/unsigned mismatch

'initializing': conversion from 'const _Ty' to 'T', signed/unsigned mismatch

'initializing': conversion from 'const _Ty' to '_Ty', signed/unsigned mismatch