Exported door model, added CollisionManager#on_ground?(entity), made gravity work in PhyisicsManager if Entity has physics enabled, updated test map

assets/base/door/model/door.mtl

@@ -0,0 +1,13 @@
+# Blender MTL File: 'door.blend'
+# Material Count: 1
+
+newmtl Material
+Ns 323.999994
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.0 0.0 0.0
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd /home/cyberarm/Code/i-mic-fps/assets/base/door/textures/door.png

assets/base/door/model/door.obj

@@ -0,0 +1,55 @@
+# Blender v2.80 (sub 75) OBJ File: 'door.blend'
+# www.blender.org
+mtllib door.mtl
+o Cube
+v 1.250000 2.400000 -0.125000
+v 1.250000 0.000000 -0.125000
+v 1.250000 2.400000 0.125000
+v 1.250000 0.000000 0.125000
+v 0.000000 0.000000 -0.125000
+v 0.000000 2.400000 0.125000
+v 0.000000 0.000000 0.125000
+v 0.000000 2.400000 -0.125000
+vt 0.923077 0.000000
+vt 1.000000 0.500000
+vt 0.923077 0.500000
+vt 0.923077 0.960000
+vt 0.846154 0.000000
+vt 0.000000 0.959961
+vt 0.384766 -0.000000
+vt 0.000000 0.000000
+vt 0.384615 0.960000
+vt 0.000000 0.000000
+vt 0.384615 0.000000
+vt 1.000000 1.000000
+vt 0.923077 0.500000
+vt 1.000000 0.500000
+vt 0.769231 0.960000
+vt 0.846154 0.000000
+vt 0.846154 0.960000
+vt 1.000000 0.000000
+vt 0.846154 0.960000
+vt 0.384766 0.959961
+vt 0.000000 0.960000
+vt 0.923077 1.000000
+vt 0.769231 0.000000
+vn 0.0000 -1.0000 0.0000
+vn 1.0000 0.0000 0.0000
+vn 0.0000 0.0000 -1.0000
+vn 0.0000 0.0000 1.0000
+vn 0.0000 1.0000 0.0000
+vn -1.0000 0.0000 0.0000
+usemtl Material
+s off
+f 2/1/1 7/2/1 5/3/1
+f 1/4/2 4/5/2 2/1/2
+f 8/6/3 2/7/3 5/8/3
+f 3/9/4 7/10/4 4/11/4
+f 8/12/5 3/13/5 1/14/5
+f 7/15/6 8/16/6 5/17/6
+f 2/1/1 4/18/1 7/2/1
+f 1/4/2 3/19/2 4/5/2
+f 8/6/3 1/20/3 2/7/3
+f 3/9/4 6/21/4 7/10/4
+f 8/12/5 6/22/5 3/13/5
+f 7/15/6 6/23/6 8/16/6