Log Message:
sysutils/xplr: update 0.21.2

Changes & fixes
 - Added CustomLayout, a new custom panel type to allow nesting other layouts
   inside a static or dynamic layout. This will allow switching between
   different layouts dynamically, without having to switch modes.
 - $LS_COLORS will have lesser priority than xplr.config.node_types.*.style.
 - Now, there's no default color set in xplr.config.node_types.*.style, so xplr
   will default to $LS_COLORS.
 - xplr -m now uses jf to render and pass messages. This allows for a more
   flexible template syntax.
 - xplr will now ask before delete.
 - For copy, move or symlink operations, xplr will ask what to do if a file
   with the same name exists.
 - CLI help menu improvements
 - Several fixes and improvements in documentation. Thanks to @kianmeng and
   @hensg for contributing.