Load intercom only if necessary

[pmusaraj]

@jnm has revived this issue and elaborated below.

Only certain users will receive access to Intercom, and the Intercom JS will not be loaded at all for the other users.

• Add a new model for conditional settings with condition, value when matched, and value when not matched
• Allow any query that can be made on the user model to be a condition
  • Pseudocode:

    if User.objects.filter(pk=request.user.pk).filter(
            matching_field=matching_value, …).exists():
        setting = value_when_matched
    else:
        setting = value_when_not_matched

  • Get that query parser in here!
• Move this into a conditional setting:

  kpi/kobo/settings/base.py

  Line 334 in 0c49d3a

  INTERCOM_APP_ID = os.environ.get('INTERCOM_APP_ID')

• Make

  kpi/kpi/context_processors.py

  Lines 12 to 13 in 0c49d3a

  	if settings.INTERCOM_APP_ID:
  	out['intercom_app_id'] = settings.INTERCOM_APP_ID

  use the new conditional setting