Release v0.14.0

• Add improved error handling for layouts (#576)
• Change layout directory from data to config (#577)
  POSSIBLE BREAKING CHANGE:
  In case of having custom layouts in the previous
  layout-dir one can switch either the layouts to
  the new dir, or set the layout-dir to be the current
  layout-dir
• Fix Makefile.toml because of missing directory (#580)
• Autodetach on force close (#581)
• Add option to specify a default shell (#594)
• Add action to run bound commands in a pane (#596)
• Initial mouse support (#448)
• Add layout-dir to setup --check subcommand (#599)