it is no longer feasible to build the blueprintjs css ourselves, so we
just use all of the default variable values and override things using
selectors instead.
This replaces the ace editor with the monaco editor. It fixes quite a
few small paper-cut bugs and should be easier to add code completion
to in the future.
Many of the snippets are omitted but can be added back later if needed.
Otherwise, we have tried to preserve the existing look and feel as much
as possible.
David Lechner