Special:Log: Convert to HTMLForm
* All Xml generation code has been removed.
* The LogEventsListGetExtraInputs hook now needs a form
descriptor array and not plain HTML.
See I37e0d3e81a46239750465b9299279fbbd7c7f87a.
* LogPager and LogEventList also take the $day parameter
for 'From date (and earlier)' and pass it to getDateCond
as well.
* Since FormOptions can't automatically extract the date
from the request this is being done manually in the
execute method of Special:Log using MWTimestamp.
Bug: T117737
Change-Id: Iba3c6aa5ac40dcdee0792c2d045b238b02d76521