www/bluefish: Adopt/Update to 2.2.13

• Switch to DISTVERSION
• Update MASTER_SITES
• Update LIB_DEPENDS: enchant->enchant2; pcre->pcre2
• Add NLS knob (dependency on gettext needed when OFF)
• Cosmetic changes by portclippy and portfmt

ChangeLog:
https://sourceforge.net/p/bluefish/code/HEAD/tree/trunk/bluefish/ChangeLog