Log Message:
editors/featherpad: update to 0.16.0

0.16.0

Changes:
- A right-click item is added to tab/side-pane for opening containing folder.
- Natural sorting of items in the side-pane and session dialog.
- The warning bar disappears when clicked or, automatically, after 10 seconds.
- "To Start Case" is added to the case changing actions.
- The 50-ms delay of format updating is removed because Qt's update requests \ 
seem appropriate now.
- Focus the editor's view with the Escape key.
- Current line highlight is made customizable.
- The recent files feature can be disabled by setting its number to zero.
- Added a "standalone" option to the command-line. It's especially \ 
useful when FeatherPad is chosen as the "git" editor.
- Fixes and improvements here and there.