Update dist contents.
Update the releasing docs.
Add USB entitlement.
Merge branch 'maintenance' into develop
Integrate ext/waf-sfiera 1a0c024.

Fix build.  Some tests still broken.
Zero-initialize site struct.

Prevents a black triangle from being drawn over the (mostly) black space
behind it.  With a gamepad, this triangle is used for the control/target
directions.
Run codesign by default.
Switch to framebuffers for offscreen.

CGLSetOffScreen() no longer works.  Framebuffers are necessary to keep
offscreen rendering working.  Fixes the build.
Merge branch 'update' into develop