[Obsolescence] Deprecate boolean line filter
============================================

 * :func:`libertem_holo.base.filters.line_filter`,
   :func:`libertem_holo.base.utils.draw_lf_rect` and
   :func:`libertem_holo.base.utils.line_filter_coords` are deprecated; use
   :func:`libertem_holo.base.filters.butterworth_line` instead.