Blender Git Loki

- small fix in Sys.c to compile on Windows:
Thanks Florian Eggenberger for telling us about it. And Greg McBride for
pointing a possible fix.
- Draw.Text and Draw.GetStringWidth updated:
Now they accept an optional second parameter to set font size and Draw.Text
returns the drawn string width.
- Partially fixed the update() and PutRaw() bugs in NMesh:
A total fix will require bigger changes, but what was done (unless buggy)
takes care of the common cases.