Modpack refactor (#4)

Split this mod into a set of sub-mods in a modpack, and in the process did a whole bunch of renovations.

* updated Subterrane's API to allow for more patterned placement of things
* added "warrens"
* clean separation of flooded and non-flooded caverns
* rearranged biomes to make cavern layers more distinct
* added oil layer
* added underworld layer

df_farming/quarry_bush.lua

@@ -0,0 +1,95 @@
+-- internationalization boilerplate
+local MP = minetest.get_modpath(minetest.get_current_modname())
+local S, NS = dofile(MP.."/intllib.lua")
+
+local quarry_grow_time = df_farming.config.plant_growth_time * df_farming.config.quarry_bush_delay_multiplier / 5
+
+local register_quarry_bush = function(number)
+	local name = "df_farming:quarry_bush_"..tostring(number)
+	local def = {
+		description = S("Quarry Bush"),
+		_doc_items_longdesc = df_farming.doc.quarry_bush_desc,
+		_doc_items_usagehelp = df_farming.doc.quarry_bush_usage,
+		drawtype = "plantlike",
+		paramtype2 = "meshoptions",
+		place_param2 = 4,
+		tiles = {"dfcaverns_quarry_bush_"..tostring(number)..".png"},
+		inventory_image = "dfcaverns_quarry_bush_"..tostring(number)..".png",
+		paramtype = "light",
+		walkable = false,
+		buildable_to = true,
+		floodable = true,
+		groups = {snappy = 3, flammable = 2, plant = 1, not_in_creative_inventory = 1, attached_node = 1, light_sensitive_fungus = 11},
+		sounds = default.node_sound_leaves_defaults(),
+
+		on_timer = function(pos, elapsed)
+			df_farming.grow_underground_plant(pos, name, elapsed)
+		end,
+
+		drop = {
+			max_items = 2,
+			items = {
+				{
+					items = {'df_farming:quarry_bush_seed 2', 'df_farming:quarry_bush_leaves 2'},
+					rarity = 6-number,
+				},
+				{
+					items = {'df_farming:quarry_bush_seed 1', 'df_farming:quarry_bush_leaves'},
+					rarity = 6-number,
+				},
+				{
+					items = {'df_farming:quarry_bush_seed'},
+					rarity = 6-number,
+				},
+			},
+		},
+	}
+
+	if number < 5 then
+		def._dfcaverns_next_stage_time = quarry_grow_time
+		def._dfcaverns_next_stage = "df_farming:quarry_bush_"..tostring(number+1)
+	end
+
+	minetest.register_node(name, def)
+end
+
+for i = 1,5 do
+	register_quarry_bush(i)
+end
+
+local place_list = {
+	minetest.get_content_id("df_farming:quarry_bush_1"),
+	minetest.get_content_id("df_farming:quarry_bush_2"),
+	minetest.get_content_id("df_farming:quarry_bush_3"),
+	minetest.get_content_id("df_farming:quarry_bush_4"),
+	minetest.get_content_id("df_farming:quarry_bush_5"),
+}
+-- doesn't set the timer running, so plants placed by this method won't grow
+df_farming.spawn_quarry_bush_vm = function(vi, area, data, param2_data)
+	data[vi] = place_list[math.random(1,5)]
+	param2_data[vi] = 4
+end
+
+df_farming.register_seed(
+	"quarry_bush_seed",
+	S("Rock Nuts"),
+	"dfcaverns_rock_nuts.png",
+	"df_farming:quarry_bush_1",
+	quarry_grow_time,
+	df_farming.doc.quarry_bush_desc,
+	df_farming.doc.quarry_bush_usage
+)
+
+minetest.register_craftitem("df_farming:quarry_bush_leaves", {
+	description = S("Quarry Bush Leaves"),
+	_doc_items_longdesc = df_farming.doc.quarry_bush_leaves_desc,
+	_doc_items_usagehelp = df_farming.doc.quarry_bush_leaves_usage,
+	inventory_image = "dfcaverns_quarry_bush_leaves.png",
+	groups = {dfcaverns_cookable = 1},
+	stack_max = 99,
+})
+minetest.register_craft({
+	type = "fuel",
+	recipe = "df_farming:quarry_bush_leaves",
+	burntime = 4
+})