Add support for games without default game (MTG) (#25)

* Add support for games without `default`

This adds support for games like Mineclonia, and any game xcompat adds
support for. The only asterix is dye support, the pattern for dyes has
been expanded for common dye mods, but if a new dye mod has different
dye names those might not work without an update to the pattern.

* Refactor & fix Farlands dye support

* Add some mcl colors, make names & their order consistent

* Fix old crafting bug & refacfor crafting

* Minor refactor & reorder for clarity

* Fix for Farlands `get_name` returning "" not nil

Farlands seems to return "" instead of nil/0 when no item is present.
By accounting for this, this commit fixes an issue where any empty slot
repaired the glider.

* Separate color handling to new module

* Luacheck fix

* Ignore empty `do end` luacheck warnings

* Replace `minetest.` with `core.`

colors.lua

@@ -0,0 +1,91 @@
+local S = hangglider.translator
+local module = {}
+
+local has_unifieddyes = core.get_modpath("unifieddyes")
+local dye_prefix_pattern_universal = "^.*dyes?:" -- Known dye prefix matches: dyes, mcl_dyes, mcl_dye, fl_dyes.
+local dye_suffix_pattern_farlands  = "_dye$"     -- A suffix appended to dye names in the Farlands game.
+
+local dye_colors = {
+	black      = "111111",
+	blue       = "0000ff",
+	brown      = "592c00",
+	cyan       = "00ffff",
+	dark_green = "005900",
+	dark_grey  = "444444",
+	green      = "00ff00",
+	grey       = "888888",
+	light_blue = "258ec9",
+	lime       = "60ac19",
+	magenta    = "ff00ff",
+	orange     = "ff7f00",
+	pink       = "ff7f9f",
+	purple     = "6821a0",
+	red        = "ff0000",
+	silver     = "818177",
+	violet     = "8000ff",
+	white      = "ffffff",
+	yellow     = "ffff00",
+}
+
+local translated_colors = {
+	black      = S("Black"),
+	blue       = S("Blue"),
+	brown      = S("Brown"),
+	cyan       = S("Cyan"),
+	dark_green = S("Dark Green"),
+	dark_grey  = S("Dark Grey"),
+	green      = S("Green"),
+	grey       = S("Grey"),
+	light_blue = S("Light Blue"),
+	lime       = S("Lime"),
+	magenta    = S("Magenta"),
+	orange     = S("Orange"),
+	pink       = S("Pink"),
+	purple     = S("Purple"),
+	red        = S("Red"),
+	silver     = S("Light Grey"),
+	violet     = S("Violet"),
+	white      = S("White"),
+	yellow     = S("Yellow"),
+}
+
+
+
+function module.get_dye_name(name)
+	-- Remove prefix and potential suffix
+	name = string.gsub(name, dye_suffix_pattern_farlands, "")
+	name = string.match(name, dye_prefix_pattern_universal.."(.+)$")
+	return name
+end
+
+
+function module.get_dye_color(name)
+	local color
+	if has_unifieddyes then
+		color = unifieddyes.get_color_from_dye_name(name)
+	end
+
+	if not color then
+		color = module.get_dye_name(name)
+		if color then
+			color = dye_colors[color]
+		end
+	end
+	return color
+end
+
+function module.get_color_name(name)
+	return translated_colors[module.get_dye_name(name)]
+end
+
+function module.get_color_name_from_color(color)
+	for name, color_hex in pairs(dye_colors) do
+		if color == color_hex then
+			return translated_colors[name]
+		end
+	end
+	return nil
+end
+
+
+return module