Edc

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- fix issues with test runners and install requires

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- review and change indexes on CRF/Requisition models
- convert unique_together to UniqueConstraint
- refactor Creator classes to refer differentiate between
`metadata` model instance and `source` model instance
- typing hints

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- get default appt_type from func get_appt_type_default()
- add settings attribute EDC_APPOINTMENT_FORM_META_OPTIONS which can
override the default labels/help_text on the appontment
form
- declare appt_type list_data explicitly
- move appt_type field and method to model mixins

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- extend lower bound of next visit window if gap days exist and allowed
- use SiteModelAdminMixin
- use `update_fields` where possible
- validate `site` when creating appointnents

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- auto-create subject-visit with reason=missed if appointment is missed
tighen up window period restriction
recalculate appointment dates relative to baseline appointment
(edc-appointment)
- tighten up report datetime relative to the appointment
add window period checks (edc-visit-tracking)
- add option to skip baseline when recalculating appointment dates
(edc-visit-schedule)
- add _clean method to call default behaviour
fix module typo (edc-form-validators)
- convert form date to utc to compare with db date (edc-crf)
- fix issue with PRN metadata entry status (edc-metadata)
- change build system (multiple modules)