Split the big "homedecor" mod into multiple sub-mods

Any of these new submods can be run without any other
components that were once part of the big "homedecor"
mod, other than homedecor_common and homedecor_i18n

Reduced dependencies where possible, but each submod still
has its various dependencies more or less the same as before,
i.e. some need basic_materials, others need unifieddyes,
some need building_blocks, and so on.

All of the stuff that used to be under homedecor/handlers
got moved to homedecor_common, as did any models and/or textures
that are used by more than one other homedecor component.

All the miscellaneous items that didn't warrant their own
mod ended up in homedecor_misc, which can also be thought
of as the remains of the original "homedecor" mod, renamed.

homedecor_common/models/homedecor_cube.obj

@@ -0,0 +1,23 @@
+# Blender v2.73 (sub 0) OBJ File: 'cobe+1.001.blend'
+# www.blender.org
+o Cylinder
+v -0.499500 -0.499500 0.499500
+v -0.499500 -0.499500 -0.499500
+v 0.499500 -0.499500 -0.499500
+v 0.499500 -0.499500 0.499500
+v -0.499500 0.499500 0.499500
+v -0.499500 0.499500 -0.499500
+v 0.499500 0.499500 -0.499500
+v 0.499500 0.499500 0.499500
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+g Cylinder_Cylinder_None
+s off
+f 5/1 6/2 2/3 1/4
+f 6/1 7/2 3/3 2/4
+f 7/1 8/2 4/3 3/4
+f 8/1 5/2 1/3 4/4
+f 1/1 2/2 3/3 4/4
+f 8/1 7/2 6/3 5/4

homedecor_common/models/homedecor_slope.obj

@@ -0,0 +1,26 @@
+# Blender v2.73 (sub 0) OBJ File: 'slope_test_slope_onetexture.blend'
+# www.blender.org
+o Cube_Cube.002
+v 0.500000 0.500000 0.500000
+v -0.500000 0.500000 0.500000
+v -0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 0.500000
+v -0.500000 -0.500000 -0.500000
+v 0.500000 -0.500000 -0.500000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vn 0.000000 -0.000000 1.000000
+vn 0.000000 -1.000000 -0.000000
+vn 0.000000 0.707100 -0.707100
+vn -1.000000 0.000000 0.000000
+vn 1.000000 0.000000 0.000000
+g Cube_Cube.002_Cube_Cube.002_front-back-bottom
+s off
+f 1/1/1 2/2/1 3/3/1 4/4/1
+f 4/3/2 3/4/2 5/1/2 6/2/2
+f 2/1/3 1/2/3 6/3/3 5/4/3
+g Cube_Cube.002_Cube_Cube.002_sides
+f 2/1/4 5/3/4 3/4/4
+f 1/2/5 4/3/5 6/4/5

homedecor_common/models/homedecor_slope_inner_corner.obj

@@ -0,0 +1,34 @@
+# Blender v2.73 (sub 0) OBJ File: 'slope_test_icorner_onetexture.blend'
+# www.blender.org
+o Cube_Cube.000
+v 0.500000 0.500000 0.500000
+v -0.500000 0.500000 0.500000
+v -0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 0.500000
+v -0.500000 -0.500000 -0.500000
+v 0.500000 0.500000 -0.500000
+v 0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 -0.500000
+v -0.500000 -0.500000 -0.500000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vn 1.000000 -0.000000 0.000000
+vn -1.000000 0.000000 0.000000
+vn 0.000000 0.707100 -0.707100
+vn 0.000000 -0.000000 -1.000000
+vn -0.000000 -1.000000 -0.000000
+vn -0.000000 -0.000000 1.000000
+vn -0.707100 0.707100 -0.000000
+g Cube_Cube.000_Cube_Cube.000_None
+s off
+f 6/1/1 1/2/1 7/3/1 8/4/1
+f 2/1/2 5/3/2 3/4/2
+f 2/1/3 1/2/3 5/4/3
+f 6/2/4 8/3/4 9/4/4
+f 9/1/5 8/2/5 7/3/5 3/4/5
+f 3/3/6 7/4/6 1/1/6 2/2/6
+f 1/1/7 6/2/7 9/3/7
+l 1 4
+l 3 4

homedecor_common/models/homedecor_slope_outer_corner.obj

@@ -0,0 +1,24 @@
+# Blender v2.73 (sub 0) OBJ File: 'slope_test_ocorner_onetexture.blend'
+# www.blender.org
+o Cube_Cube.002
+v 0.500000 0.500000 0.500000
+v -0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 0.500000
+v -0.500000 -0.500000 -0.500000
+v 0.500000 -0.500000 -0.500000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vn 0.000000 -1.000000 -0.000000
+vn 1.000000 0.000000 0.000000
+vn 0.000000 -0.000000 1.000000
+vn -0.707100 0.707100 0.000000
+vn 0.000000 0.707100 -0.707100
+g Cube_Cube.002_Cube_Cube.002_None
+s off
+f 3/1/1 2/2/1 4/3/1 5/4/1
+f 1/2/2 3/3/2 5/4/2
+f 1/1/3 2/3/3 3/4/3
+f 1/1/4 4/3/4 2/4/4
+f 1/2/5 5/3/5 4/4/5