[MDL-41017] htmlpurifier caching improvements - Moodle Tracker

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Affected Branches:
MOODLE_26_STABLE
Fixed Branches:
MOODLE_26_STABLE
Pull from Repository:
https://github.com/skodak/moodle.git
Pull Main Branch:
w32_~~MDL-41017~~_m26_purifier
Pull Main Diff URL:
https://github.com/skodak/moodle/compare/w32_MDL-41017_m26_purifier
Testing Instructions:

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1/ install moodle
2/ upgrade moodle
3/ run phpunit tests
4/ add some forum with posts and verify the stuff texts display fine
5/ purge caches and verify the forums again
6/ delete the cachedir and localcachedir from OS and reload the page with forum posts and verify results

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1/ install moodle 2/ upgrade moodle 3/ run phpunit tests 4/ add some forum with posts and verify the stuff texts display fine 5/ purge caches and verify the forums again 6/ delete the cachedir and localcachedir from OS and reload the page with forum posts and verify results

List of known problems:

our default cache for purify_html() is in cachedir - very slow if networked share
it is not compatible with local caches on cluster nodes
the cache files from HTMLPurifier are in cachedir
allowobjectembed setting changes are ignored
unchanged texts are stored in cache - this is not necessary
there is a nasty hack in purge_all_caches()

has been marked as being related by

MDL-41019 language caching improvements