OPENOLAT-330: initial revision of the new content creation dialog, migrating some changes to the nodewizard

OO-2097: fallback for files with underscore, and special case  for files with underscore and special characters

OO-2092: check if the parent message exist, if not handle the error gracefully and reload the thread

OO-2091: participants are not allowed anymore to bulk e-mail or copy groups, beautify messages, warning if not all groups are "editable"

OPENOLAT-330: added catalog dropdown element to the course creation dialog, show only one create button always opening the wizard

OPENOLAT-330: new parameters inputClear, inputDropdown, highlight and limit for the FlexiAutoCompleterController,
now using bootstrap input-group for the autocompleter input element (dropdown and clear buttons) therefore needing some css fixes

OPENOLAT-330: removed obsolete function findExistingOlatCourses, allow * wildcards in the sis course query

OPENOLAT-368: sort list of external courses showing not yet created courses first and by title descending

OPENOLAT-367: show error message to user when there is an exception fetching the search results from the SIS