call overlay option hooks
improved default spacing for presentation css
improved spacing for tables and indented lists
eliminate === auto-insert behavior
tweak keyword highlighting to not pickup urls and headings ended with colon
force monospace font in qt preview
Revert "force monospace font in qt preview"

This reverts commit 3a7f275216ec2270d5f39bf21b9ab447e0d19e04.
only set RSTUDIO_HTTP_REFERER in server mode
add todos