Show draft features from projects if available and authorized, fall back to milestone max if draft not available or user not authorized about cmv-app

[wmbeers]

Note: project 9291 is a good candidate for testing--it has very different geometry in draft than the most recent milestone. It exists this way on dev and stage, and possibly prod. Other candicates can be found with this sql:

select *
from draft_alternatives d
inner join milestone_max_alternatives mma
    on d.project_alt = mma.fk_project_alt
where d.shape <> mma.shape;

[wmbeers]

This issue has been incorporated into #67. We can close this when that issues is complete.