Fixed announce script command support for bc_blue and bc_woe

- Fixes an issue where it wasn't possible to use bc_blue or bc_woe at
  the same time as bc_map, bc_area or bc_self.
  (this partly works around bugreport:7693 -
  http://hercules.ws/board/tracker/issue-7693-character-with-name )
- Replaced bc_* related values from various places through the sources
  with constants.

Signed-off-by: Haru <haru@dotalux.com>