Track changes to options more deeply

Traverses array members looking for changes
Drop the pre-decrementation
Make posts and taxonomies connectors watch for late registrations of post types and taxonomies #566
Bring back usage of cached labels
Merging develop into connector-based-labels-refresh
Merging develop into deep-options-tracking
Merge pull request #573 from x-team/deep-options-tracking

Track changes to options more deeply
Get labels using tax/post objects, fixes EditFlow compat
Fix var name typo
Merge pull request #586 from x-team/connector-based-labels-refresh

Bring back usage of cached labels
Merging develop into issue-585, resolving conflict