graphics/frei0r*: Update to 2.3.0 [1]

Split cairo-dependent plugins out into graphics/frei0r-plugins-cairo.

Shift pkg-plist and several variables out into the slave ports for
easier maintainence, including PORTREVISION to facilitate usage of
PORTREVISION bump scripts.

Convert "extra" patches into regular patches for easier future
maintainence.

Ensure optional plugins are the same version as the frei0r base.

https://github.com/dyne/frei0r/releases/tag/v2.3.0

PR: 272045 [1]
Reported by: Olivier Duchateau <duchateau.olivier@gmail.com> [1]