fixed mantis 0023261: LoK-Ex-Import führt zu Fragen-Doubletten ohne Kompetenzen (fixed by filtering on question duplicates, import seems to create originals behind a duplicate - both staying in the test)

Merge branch 'fix/0023115/5-1/showing-bibliographic-list-brings-class-ilimagelinkbutton-not-found-bug' of https://git.studer-raimann.ch/ILIAS/Core into release_5-1

(cherry picked from commit 14a3122c)

fixed wrong selection of participant passes that causes wrongly aggregated answer behaviours for the corrections tab

(cherry picked from commit 35dd95e5)

Alexander Killing authored Mar 15, 2018 and Bjoern Heyser committed Jun 02, 2018

fixed bug #22708: Cloze Questions in SCORM Learning Module: Correct answers are not shown in Firefox.

fixed // mantis 0020078: Numeric gap accepts formulas but should only accept nummeric values // 0022929: Failed test: Numerische Antwort Frage erstmalig beantworten

html-purify essay submissions only when html is detected, changed formaly unqualified detection of html content

fixed non available trigger Save contributet by assTextQuestion itself (formaly only when charcounter in use)

changed hint accoding to the behhaviour that nothing get cut on exceeding the limit, fixed letter count in solution output to not consider html of any kind, streamlined strip and decoding behaviour with js check during getTestOutput

removed shortening essay solution on submit that happened on crazily detected html only, removed general and very crazy html stripping, replace all confuse by a simple ilAssHtmlUserSolutionPurifier sanitized text grabbed from POST

removed inline eventhanler for letter counter from template, tinymce also in preview + letter counter compatibility for preview

cleaned up test player template from charCounter, centralized charcounter js code, made it qid sensitive, changed templates to use more speaking identifiers, integrated charcounter into getTestOutput

fixed mantis 0023023: ExtraTime is only available at limit of test passes is one ... description missing

(cherry picked from commit cca9e776)

(cherry picked from commit e446dccd)