Add shift+wheel (and Q/E, and ctrl+arrows, and ctrl+WASD) to rotate the
camera.
Restrict the rotation and zoom to narrow ranges. (Constraints can be
disabled in the dev overlay).
Smooth the movement and rotation.
Fix some stupid whitespace.
Fix some const correctness.
This was SVN commit r7930.
Add buttons to open the web site and IRC.
Tentatively allow Atlas to be launched from the menu.
Add some shutdown functions to support relaunching into Atlas without
having to restart the whole process.
This was SVN commit r7714.
