Issue #1230786 + Issue #1231160: Fixing content_attributes_array in hook_preprocess_node & fixing incorrect 'There are no unassigned regions' on the theme settings UI.

Regions custom css has to be named wrapper_css instead of css to be applied to .region instead of .region-inner.

Regions custom css has to be named wrapper_css instead of css to be applied to .region instead of .region-inner.

We are now aggregating all grid information in the new theme container aswell for even better caching.

Major overhaul of most of the code. Removed preprocess/process folders from core to increase performance.