www/bluefish:

• Update to 2.2.9
• Switch to GTK3 by default (follow upstream default)
• Remvoe --with-gtk2=no as it is not used by configure
• Add LIB_DEPENDS and USE_GNOME as found by new stage-qa test
• Take maintainership

Approved by: adamw (mentor)
Relnotes: https://sourceforge.net/p/bluefish/code/HEAD/tree/tags/bluefish_2_2_9/ChangeLog
Differential Revision: https://reviews.freebsd.org/D6892