Issue 2163959 by Alan D., Boniro, et al: Fixes multiple errors that can occur after a content type is renamed.

Issue 2163959 by Alan D., Boniro, et al: Prevents a fatal error when there are invalid configuration settings. Bandaid, not a fix for the root cause.

Issue 1691770 by Alan D.: Makes non-teaser view modes hidden by default to prevent regression where these appear everywhere by default.

=Issue 1691770 by Alan D., Bernsch: Work with other view modes and extended to work with any entity and allows customizations of the read more link itself.

Issue #1504032: Wrong variable in hook_node_type_update() results in failed mirgation of settings when content type is renamed.

Issue #1504032 by Alan D.: Implementing hook_node_type_update() and _delete() to track content type variables.