add View > Files (#1613)

* add View > Files

* make Files media type resolution multi-threaded

* improve Files thumbnail performance

* improve Files media type performance

* implement Files > Update Thumbnails

* add Files panel to default layouts

* update style of Files media type buttons

* enable sorting in details mode

* details view improvements

* minor improvements to view modes

* add `files/viewMode` to settings

* display size in tiles view

* more media type filename extensions

* add sub-folder navigation

* fix cosmetic regression in playlist icons view

* add Locations combo

* refactor to FilesDock::changeDirectory()

* add Show In Files

* add Files > Show In File Manager

* add Open With

* fix compile error on macOS & Linux

* fix Enter to open on macOS

* remove a verbose log line

* fix layout on Qt 6.4/Linux

* fix View > Files shortcut

* mov is too generic

src/CMakeLists.txt

@@ -42,6 +42,8 @@ add_executable(shotcut WIN32 MACOSX_BUNDLE
   dialogs/unlinkedfilesdialog.ui
   docks/encodedock.cpp docks/encodedock.h
   docks/encodedock.ui
+  docks/filesdock.cpp docks/filesdock.h
+  docks/filesdock.ui
   docks/filtersdock.cpp docks/filtersdock.h
   docks/jobsdock.cpp docks/jobsdock.h
   docks/jobsdock.ui