audio/calf: Update 0.0.60 -> 0.90.0; Rename to audio/calf-lv2

Port changes:

• Take maintainership
• Change to DISTVERSION
• Add missing dependencies to LIB_DEPENDS
• Add USE_GNOME
• Add USE_CXXSTD
• Add USE_LDCONFIG
• Change docs in pkg-plist to PORTDOCS=*
• Add post-install that fixes the absolute links
• Move patching from post-patch to files/
• Add patches to src/Makefile.am that unbreak the build of 0.90 based on Vincent Torri <vincent.torri@gmail.com> advice on the automake@gnu.org mailing list.
• Rename to calf-lv2 because this port primarily provides LV2 plugins