Blender Git Loki

Text Object: Vertical Alignment

A new option for Font/Text objects vertical alignment:

* Top Base-Line (current mode)
* Top
* Center
* Bottom

The Top is the equivalent as the Top-Baseline with an empty line at the begin of the
text. It's nice to have this option too though, since if we are driving
the alignment via Python we don't want to add extra lines to the text
only to accomodate to the desired vertical alignment.

The Center and Bottom are as intuitive as their name suggest.

When working with text boxes, the vertical alignment only work for
paragraphs that are not vertically full.

Many thanks to Campbell Barton (ideasman42 / @campbellbarton) for the
code review, code comments, and overall suggestions and changes :)

Reviewers: campbellbarton

Differential Revision: https://developer.blender.org/D2061