This feature adds an admin tool for creating custom licenses.
Now custom licenses can be added and amended in Moodle, and the site
default can be set to a custom license.
Core licenses remain hard-coded and are uneditable, so they will always
require update within Moodle core updates, and maintain their
internationalisation through core language strings.
This also includes fundamental changes to the license API including
the addition of license caching and deprecation of no longer required
admin settings for license management.
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