KNL-1255 fixed "View Site As" no longer working in some tools it previously worked in (cache invalidation)

git-svn-id: https://source.sakaiproject.org/svn/kernel@309531 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1254 fixed Sakai doesn't startup in legacy cache mode when ical.experimental is set.

git-svn-id: https://source.sakaiproject.org/svn/kernel@309533 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1253 Improved support to add an option to better handle interpreting html into the intended plain text

git-svn-id: https://source.sakaiproject.org/svn/kernel@309575 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1253 Fixed the static passthrough method to be actually static

git-svn-id: https://source.sakaiproject.org/svn/kernel@309576 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1254 merge 309533 to 10.x

git-svn-id: https://source.sakaiproject.org/svn/kernel@309581 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1255 merge 309531 to 10.x

git-svn-id: https://source.sakaiproject.org/svn/kernel@309582 66ffb92e-73f9-0310-93c1-f5514f145a0a