storagemanager: Add keyval+ (combined keyval + map) store type This combines the two most common store types, which modules often end up opening with both interfaces separately anyway. As well as combining them, I've taken the opportunity to improve some of the method names to make them clearer.

if not math.type then

	local function math_type(t)
		if type(t) == "number" then
			if t % 1 == 0 and t ~= t + 1 and t ~= t - 1 then
				return "integer"
			else
				return "float"
			end
		end
	end
	_G.math.type = math_type
end