core: add missing feature in ChangeLog for v0.4.3 (use one date format when day changes from day to day+1)
core: add bare display mode (for easy text selection and click on URLs)

New key: alt+"!", to swith to bare display (same key to come back to
standard display).

New options:
- weechat.look.bare_display_exit_on_input (default: on): by default
  any changes in input will return to standard display
- weechat.look.bare_display_time_format (default: "%H:%M"): the format
  of time used in bare display.