MDL-40308: Privacy settings do not change

Update LTI mod form so checkboxes always submit their value.
MDL-39754 copy 2.5 requirements to Moodle 2.6

Optional features and warnings may be added later,
but we need at least required environment for 2.5.1

This includes database family cleanup and more realistic memory requirement.
Merge branch 'w27_MDL-39754_m22_evn26' of https://github.com/skodak/moodle into MOODLE_22_STABLE
MDL-37818 - RSS - Prevent access to blocks while RSS context errors are displayed
MDL-39628 Chat: check mod/chat:chat capability when using daemon.

Thanks to Francois Gauthier for report/fix.
MDL-39570 mod_feedback - Missing privilege check
MDL-40308: Fix javascript for lti mod_form

It was toggling the state of the hidden input - not the checkbox.
weekly release 2.2.10+
Merge branch 'MOODLE_22_STABLE' into MOODLE_22_BFC