R1:114ed6c7feea

DarkConsole: fix rendering, move request log, load over ajax

Summary:
This accomplishes three major goals:

# Fixes phutil_render_tag -> phutil_tag callsites in DarkConsole.
# Moves the Ajax request log to a new panel on the left. This panel (and the tabs panel) get scrollbars when they get large, instead of making the page constantly scroll down.
# Loads the panel content over ajax, instead of dumping it into the page body / ajax response body. I've been planning to do this for about 3 years, which…