Added support for lightmap path and intensity options to BOMLoader (BOMv1).

Added support for second UV channel to BOMLoader (BOMv1).
Added example AltspaceVR app demonstrating lightmapped models (and source OBJ/MTL files to demonstrate comment annotation syntax usage).

Author: David Cormack

examples/altspace/lightmap/assets/pillar.mtl

@@ -0,0 +1,13 @@
+newmtl pillar
+	Ns 10.0000
+	Ni 1.5000
+	d 1.0000
+	Tr 0.0000
+	Tf 1.0000 1.0000 1.0000
+	illum 2
+	Ka 0.5882 0.5882 0.5882
+	Kd 0.5882 0.5882 0.5882
+	Ks 0.0000 0.0000 0.0000
+	Ke 0.0000 0.0000 0.0000
+	map_Ka pillar.png
+	map_Kd pillar.png