This activity currently supports two different preset types:
- Datapreset plugins, that can be installed copying them to the
mod/data/preset folder.
- Presets saved manually by users.
This commit adds an attribute to the presets to mark them, in order
to identify them later (because, for instance, the plugins can't be
removed).
Apart from that, the methods in lib.php, involved with this issue, have
been deprecated. New methods have been implemented in the manager class,
covering them with PHPUnit tests.
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