Handle wood_tile replacement more carefully.

- An LBM is added to handle replacements of wood_tiles on the map while preserving there rotation about the +y (vertical) axis.  This will preserve existing floor patterns.  Unfortunately, due to the preexisting side tile orientations, preserving wall patterns is not possible while also reducing the wood_tiles down to just one node.

 - Deprecate the no longer used wood_tiles (wood_tile_right, wood_tile_left, wood_tile_down, and wood_tile_flipped), and add recipes to convert them.

 - Rename wood_tile_up to wood_tile_offset.

Closes #101

crafting.lua

@@ -44,6 +44,12 @@ minetest.register_craft({
 	}
 })
 
+minetest.register_craft({
+	type = "shapeless",
+	output = "moreblocks:wood_tile",
+	recipe = {"moreblocks:wood_tile_flipped"}
+})
+
 minetest.register_craft({
 	output = "moreblocks:wood_tile_center 9",
 	recipe = {
@@ -62,13 +68,31 @@ minetest.register_craft({
 })
 
 minetest.register_craft({
-	output = "moreblocks:wood_tile_up",
+	output = "moreblocks:wood_tile_offset",
 	recipe = {
 		{"default:stick"},
 		{"moreblocks:wood_tile_center"},
 	}
 })
 
+minetest.register_craft({
+	type = "shapeless",
+	output = "moreblocks:wood_tile_offset",
+	recipe = {"moreblocks:wood_tile_down"}
+})
+
+minetest.register_craft({
+	type = "shapeless",
+	output = "moreblocks:wood_tile_offset",
+	recipe = {"moreblocks:wood_tile_left"}
+})
+
+minetest.register_craft({
+	type = "shapeless",
+	output = "moreblocks:wood_tile_offset",
+	recipe = {"moreblocks:wood_tile_right"}
+})
+
 minetest.register_craft({
 	output = "moreblocks:circle_stone_bricks 8",
 	recipe = {