games/burrtools: minor improvements
- Unbundle lua 5.1
- Adjust category and fix icon path in .desktop file
- Avoid overlinking FLTK dependencies
- Integrate DragonFly fix
- Drop unnecessary patch
- Drop unused xmlwrapp dependency
- Convert to USES=localbase
- Pacify stage-qa (shared libs)
- Pacify portlint (regen patches)