feat: Add additional scan time options

- Add option to include file existence check at end of scan, speeds up
  end of scan operation time considerably, however if user has removed
  or moved files since starting a scan there could be later errors when
  interacting with results.  Defaults to existing behavior of including
  the check, until it can be verified later dialogs and actions handle
  non-existent items better.
- Add option to ignore differences in mtime when checking hash cache.
  Option is present in advanced tab of preferences.  Closes #1022.
- Regenerate pot files for translations

qt/preferences.py

@@ -161,6 +161,8 @@ class Preferences(PreferencesBase):
         self.ignore_hardlink_matches = get("IgnoreHardlinkMatches", self.ignore_hardlink_matches)
         self.use_regexp = get("UseRegexp", self.use_regexp)
         self.remove_empty_folders = get("RemoveEmptyFolders", self.remove_empty_folders)
+        self.rehash_ignore_mtime = get("RehashIgnoreMTime", self.rehash_ignore_mtime)
+        self.include_exists_check = get("IncludeExistsCheck", self.include_exists_check)
         self.debug_mode = get("DebugMode", self.debug_mode)
         self.profile_scan = get("ProfileScan", self.profile_scan)
         self.destination_type = get("DestinationType", self.destination_type)
@@ -231,6 +233,8 @@ class Preferences(PreferencesBase):
         self.use_regexp = False
         self.ignore_hardlink_matches = False
         self.remove_empty_folders = False
+        self.rehash_ignore_mtime = False
+        self.include_exists_check = True
         self.debug_mode = False
         self.profile_scan = False
         self.destination_type = 1
@@ -283,6 +287,8 @@ class Preferences(PreferencesBase):
         set_("IgnoreHardlinkMatches", self.ignore_hardlink_matches)
         set_("UseRegexp", self.use_regexp)
         set_("RemoveEmptyFolders", self.remove_empty_folders)
+        set_("RehashIgnoreMTime", self.rehash_ignore_mtime)
+        set_("IncludeExistsCheck", self.include_exists_check)
         set_("DebugMode", self.debug_mode)
         set_("ProfileScan", self.profile_scan)
         set_("DestinationType", self.destination_type)