More config and testing adding models

Seperated Sanbox premake config from the main premake file.

SandboxApplication/models/Cube.mtl

@@ -0,0 +1,12 @@
+# Blender 3.1.2 MTL File: 'None'
+# www.blender.org
+
+newmtl Material
+Ns 360.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2

SandboxApplication/models/Cube.obj

@@ -0,0 +1,40 @@
+# Blender 3.1.2
+# www.blender.org
+mtllib Cube.mtl
+o Cube
+v 1.000000 1.000000 -1.000000
+v 1.000000 -1.000000 -1.000000
+v 1.000000 1.000000 1.000000
+v 1.000000 -1.000000 1.000000
+v -1.000000 1.000000 -1.000000
+v -1.000000 -1.000000 -1.000000
+v -1.000000 1.000000 1.000000
+v -1.000000 -1.000000 1.000000
+vn -0.0000 1.0000 -0.0000
+vn -0.0000 -0.0000 1.0000
+vn -1.0000 -0.0000 -0.0000
+vn -0.0000 -1.0000 -0.0000
+vn 1.0000 -0.0000 -0.0000
+vn -0.0000 -0.0000 -1.0000
+vt 0.625000 0.500000
+vt 0.375000 0.500000
+vt 0.625000 0.750000
+vt 0.375000 0.750000
+vt 0.875000 0.500000
+vt 0.625000 0.250000
+vt 0.125000 0.500000
+vt 0.375000 0.250000
+vt 0.875000 0.750000
+vt 0.625000 1.000000
+vt 0.625000 0.000000
+vt 0.375000 1.000000
+vt 0.375000 0.000000
+vt 0.125000 0.750000
+s 0
+usemtl Material
+f 1/1/1 5/5/1 7/9/1 3/3/1
+f 4/4/2 3/3/2 7/10/2 8/12/2
+f 8/13/3 7/11/3 5/6/3 6/8/3
+f 6/7/4 2/2/4 4/4/4 8/14/4
+f 2/2/5 1/1/5 3/3/5 4/4/5
+f 6/8/6 5/6/6 1/1/6 2/2/6