Switch to xorgproto instead of individual packages

Upstream used to distribute protocol headers as separate packages, but has
decided to merge those to a common package, named xorgproto. This update
tracks that change.

• Add a new port, x11/xorgproto, with are protocol headers for xorg.
• Hook the new protocol port to the build and to infrastructure in bsd.xorg.mk.
• Update all ports with a dependency on any of the old *proto packages to instead depend on xorgproto. Bump portrevision.
• Delete the old *proto packages, update MOVED.

PR: 230023
Submitted by: zeising
Approved by: portmgr (antoine)
exp-run by: antoine