aux auto bid and price heuristics

this commit does two things
1. it implements auto bid just like auto buy
2. it has some minimum pricing heuristics when posting items. this behavoiur actiaves when the post bid price is set to 0, the buyout price behaves like a minimum

aux-addon/color.lua

@@ -0,0 +1,51 @@
+module 'aux'
+
+local T = require 'T'
+
+function C(r, g, b, a)
+	local mt = T.map('__metatable', false, '__newindex', pass, 'color', T.list(r, g, b, a))
+	function mt:__call(text)
+		local r, g, b, a = unpack(mt.color)
+		if text then
+			return format('|c%02X%02X%02X%02X', a, r, g, b) .. text .. FONT_COLOR_CODE_CLOSE
+		else
+			return r/255, g/255, b/255, a
+		end
+	end
+	function mt:__concat(text)
+		local r, g, b, a = unpack(mt.color)
+		return format('|c%02X%02X%02X%02X', a, r, g, b) .. text
+	end
+	return setmetatable(T.acquire(), mt)
+end
+
+M.color = immutable-{
+	none = setmetatable({}, {__metatable=false, __newindex=pass, __call=function(_, v) return v end, __concat=function(_, v) return v end}),
+	text = immutable-{enabled = C(255, 254, 250, 1), disabled = C(147, 151, 139, 1)},
+	label = immutable-{enabled = C(216, 225, 211, 1), disabled = C(150, 148, 140, 1)},
+	link = C(153, 255, 255, 1),
+	window = immutable-{background = C(24, 24, 24, .93), border = C(30, 30, 30, 1)},
+	panel = immutable-{background = C(24, 24, 24, 1), border = C(255, 255, 255, .03)},
+	content = immutable-{background = C(42, 42, 42, 1), border = C(0, 0, 0, 0)},
+	state = immutable-{enabled = C(70, 140, 70, 1), disabled = C(140, 70, 70, 1)},
+
+	tooltip = immutable-{
+		value = C(255, 255, 154, 1),
+		merchant = C(204, 127, 25, 1),
+		disenchant = immutable-{
+			value = C(25, 153, 153, 1),
+			distribution = C(204, 204, 51, 1),
+			source = C(178, 178, 178, 1),
+		}
+	},
+
+	blue = C(41, 146, 255, 1),
+	green = C(22, 255, 22, 1),
+	yellow = C(255, 255, 0, 1),
+	orange = C(255, 146, 24, 1),
+	red = C(255, 0, 0, 1),
+	gray = C(187, 187, 187, 1),
+	gold = C(255, 255, 154, 1),
+
+	blizzard = C(0, 180, 255, 1),
+}