[MDL-41019] language 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:
w33_~~MDL-41019~~_m26_langcaches
Pull Main Diff URL:
https://github.com/skodak/moodle/compare/master...w33_MDL-41019_m26_langcaches
Testing Instructions:

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0/ run phpunit tests
1/ install via web and CLI
2/ upgrade
3/ try cache purging
4/ try disabling lang caching
5/ add some lang packs
6/ modify lang pack
7/ try restricting the list of visible language packs

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0/ run phpunit tests 1/ install via web and CLI 2/ upgrade 3/ try cache purging 4/ try disabling lang caching 5/ add some lang packs 6/ modify lang pack 7/ try restricting the list of visible language packs

Issues to be resolved:

lang menu caches is s till using php file in cache dir - move to MUC
use revision to make langmenu + string caches clustering friendly
migrate to class loader and new 'core_' for class names
improve performance by eliminating hacky resets when invalid stringid used - develoeprs MUST learn to purge all caches or disable $CFG->langstringcache in config.php

has a non-specific relationship to

MDL-41017 htmlpurifier caching improvements

has been marked as being related by

MDL-41221 Fatal error: Class 'core_string_manager_standard' not found

Participants:: Adrian Greeve, Dan Poltawski, Frédéric Massart, Petr Skoda, Sam Hemelryk