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.
Giant merge from
http://svn.wildfiregames.com/hg-source/file/5fb522019d5e
Infrastructure is largely complete, gameplay is largely missing
Disabled by default; use command-line flag "-sim2"
(Second attempt at commit...)
This was SVN commit r7259.
