Update and clean up the ioquake3 family of ports.

The following maintenance operations were performed:

• Recreate all patches with make makepatch
• Add LICENSE
• Update MAINTAINER to kami@freebsd.org
• games/ioquake3
  • Replace a lot of .if ${PORT_OPTIONS:MFOO} with bsd.options.mk fu
  • Add support for slaves using different SDL versions
• games/ioquake3-devel
  • Update to GIT revision 2808
  • Use SDL2
• games/iourbanterror
  • Change treatment of patches so make makepatch doesn't screw the patches in ${MASTERDIR}/files over
  • Update 4.2.018 to 4.2.023
• games/urbanterror-data
  • Update 4.2.018 to 4.2.023
  • Fix install without DOCS

Reviewed by: cs
Approved by: cs
Differential Revision: https://reviews.freebsd.org/D5816