graphics/fractgen: Improve port

• Simplify option names: FRACTGEN_CLI => CLI and etc.
• Move CLI KDE QT to MULTI - at least on option must be enabled.
• Move examples from DATADIR to EXAMPLESDIR.
• Sort plist.

PR: 295702
Approved by: Thomas Dreibholz <thomas.dreibholz@gmail.com> (maintainer, timeout 2 weeks)
Sponsored by: UNIS Labs