Tendenci

* Updated nav editor to allow tel: links
* Cleaned up RegConfPricingBaseFormSet
* Fixed a ValueError for PricingForm
* Fixed an AttributeError for stripe payment
* Resolved some issues for forms so that users with permissions can add/edit forms at front end instead of admin backend

* Resolved the issue about tinymce menu not showing on fullscreen for events add/edit
* Fixed an error in exports regarding 'Options' object has no attribute 'virtual_fields'
* Fixed the issue about newsletters automatically include events content
* Fixed a ValueError at studygroups edit
* Fixed a KeyError at membership export

* Removed .doc and .xls from the allowed file upload extensions for the security reason. Besides the general threats, determining the mime type for the .doc and .xls files (generated by old MS Word and MS Excel) requires feeding the entire file content due to their format not complying with the standard.
* Resolved an issue "No module named 'django.forms.extras'" for memberships, corporate memberships and custom forms that could occur when 'django.forms.extras...' is still stored in the field_type but django.forms.extras has been moved to django.forms.widgets since Django 1.9.

* Resolved some issues in memberships edit
* Fixed a TypeError at clone event
* Resolved the issue about creator not being assigned on pages and articles add

* Updated membership backend UX
* Meta title update for articles and news - removed the 100 characters limit and the silly "..."
* Removed the themes dropdown on theme editor
* Fixed a IllegalMonthError at events month view (ex: /events/2020/0/)
* Fixed a AttributeError at photos zip
* Avoided a DataError at get_email command
* Fixed a TypeError for forms

* Updated django version to 2.2.12
* Some bugfixes for profiles and groups permission edit
* Fixed a TypeError when payment is not fully set up
* Updated format for the groups perms edit
* Appended ?rel=0 to avoid unrelated youtube videos being displayed when video finishes