Edc

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- track LTFU model in schedule, fix view detecting wrong schedule
if more than one exists (edc-visit-schedule)
- fix incorrect action description, get next action using LTFU
model name (edc-visit-tracking)

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- evaluate glucose field values consistently in form validators
- change fasted to fasting for consistency
- update lab / utestid field to have "_value" suffix
- update imports for classes moved out of respond africa

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- fix required_if_true to equate blank and None (edc-form-validator)
- fix issues with subjectvisitmissed validator (edc-visit-tracking)

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- add new requirement (edc-ltfu)

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- also inspect crfs_missed when querying CrfMetadata for subject
visit (edc-metadata)
- add testcase methods for getting appointment and next appointment
(edc-appointment)
- add subjectvisitmissed formvalidator mixin, model mixin, action item
(edc-visit-tracking)
- more constants (edc-constants)
- allow to opt-out of TMG workflow in actions, add attr for offschedule
reason field (edc-adverse-event)
- add method `m2m_applicable_if_true` (edc-form-validators)
- move load_list_data to function (edc-list-data)
- refer to action by name using constant (edc-locator)
- add slider widget and resources for adherence visual scale
(edc-model-fields)
- add off study action item (edc-offstudy)
- register CRFs listed in crfs_missed (edc-reference)

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- modify how facility selects an available appt date by changing the
order of precedence (edc-facility)
- enforce window period defined on the visit object
from edc-visit-schedule (edc-appointment)
- enforce window period using visit lower/upper for scheduled appointments
and lower as visit.lower and upper as next_visit.lower for
unscheduled appointments (edc-visit-schedule)
- rename method `visit` to `visit_from_schedule` to avoid being overriden
by AppointmentModelMixin. Keep `visit` available as a wrapper for
`visit_from_schedule` (edc-visit-schedule)
- add days, `d`, to duration YMD field and validation (edc-model)
- add slider widget (edc-model)
- add `in` operator to predicate evaluation (edc-metadata-rules)
- default responses to `other` in m2m_other_specify (edc-form-validators)
- add `export_format` to user profile (edc-auth)
- remove `site` framework from model (edc-reference)