As a part of this add the Rotatable layout modifier that can rotate the
windows 90 degrees using Shift+Mod+r.

Old bug where shifting workspaces relatively using mod-n/p would not
work as expected where visible workspaces without any windows would be
skipped over or plain not work.

dynamicLogWithPP does not support Unicode properly!! It was encoding
each "Char" (32 bits in Haskell, mind you!) to a utf-8 byte instead of a
codepoint. The result was a butchared faux-utf8 encoded string.

This was causing xmobar to crash with unicode + my truncating code. I
have now moved away from dynamicLogWithPP and am writing my own log
string manually. It's better this way anyway; less hacky; more
fine-grained control.