Deprecation notices in Moodle 4.5

[djarran]

When testing this plugin in Moodle 4.5, I encountered the following deprecations. Note that everything else functioned perfectly

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On index page of mod instance

 Deprecated: Creation of dynamic property mod_observation\table\timeslots\timeslots_table::$displaymode is deprecated in /var/www/quote-405/mod/observation/classes/table/timeslots/timeslots_table.php on line 84

When editing observation view points: mod/observation/viewpoints.php?id=1

 Deprecated: Creation of dynamic property mod_observation\table\viewpoints\viewpoints_table::$context is deprecated in /var/www/quote-405/mod/observation/classes/table/viewpoints/viewpoints_table.php on line 72

Deprecated: Creation of dynamic property mod_observation\table\viewpoints\viewpoints_table::$displaymode is deprecated in /var/www/quote-405/mod/observation/classes/table/viewpoints/viewpoints_table.php on line 79