[mapguide-internals] MapGuide RFC 186 - Support label justification for basic stylization

[Jackie Ng]

Hi All,

New year, new RFC for review:

https://trac.osgeo.org/mapguide/wiki/MapGuideRfc186

This fixes a 14 year old bug in multi-line labeling due to limitations of
the basic stylization engine.

https://trac.osgeo.org/mapguide/ticket/772

It's an RFC instead of a direct commit fix because this fix requires a
Layer Definition schema change.

- Jackie