Blender Git Loki

Fix T46522: DataTransfer modifier: Impossible to set multiple transfer modes by script
(if they're on different properties).

This patch basically gets rid of (ui-related) hack where we was adding specific
'fake' enums for datatypes needing additional options.

That was done because of broken UI code - to summarize, 'align' code did not support
correctly layout mixing vertical and horizontal sub-layouts, in particular if
it was 'column-major'.

A complete rewrite of this align code has been done, so now we can use a more
sane UI code.