Player update

In the newest version of the player we have included these additions:

1. In the Automatic Feedback module there are new commands added and a new mode available, module's documentation is also updated.
2. There is a new event in the Editable Window module that is fired when the module is closed, so you can react to it e.g. from the Advanced Connector module or a Custom Addons in your content. Also we have added the missing documentation page about this module.
3. In the Cross Lesson module we've added a new "Check for access" property that allows to check if the current user has the access to specific resources defined in the "Access IDs". To make this possible we are relying on the data provided to the player by the LMS platform that is hosting the lesson - for the feature to work, the external environment has to send an iframeMessage with the 'crossLessonHasUserAccess' set to 'True' or 'False' depending on the actual status of the user's access. The full description of these new properties has been added to the module's documentation page.

There were also two bugs, that we've fixed:

1. In the Crossword module it was possible to edit the initial letters (the ones that are visible from the start - preceded by "!") in Show Answers mode - it is now properly blocked.
2. The player's embedded TTS Keyboard Navigation mechanism was omitting modules that were disabled (e.g. Choice module), now it is possible to navigate to those modules and have their contents read aloud.