#1427794: Fix an issue where view names longer than 25 characters would cause display settings not to save

#1414930: Fix an issue where preprocess and ignored fields inside fieldgroups never received content, and were thus unrendered.

Revert "Handle ds rendering using a proper Class, and prepare for switchable layouts and attribute settings"

This reverts commit 0e5b15d0.

#1426264: Fix an issue where the same node rendered in different build modes would always use the first build mode

#1422448 by xtfer: Fix an issue where an empty body field would sometimes be populated with other field content