Property definitions

nitc :: loader $ MPackage :: _import_aliases_parsed
	private var import_aliases_parsed: nullable Map[String, ExternalPackage] is lazy do
		var ini = ini
		if ini == null then return null

		var import_line = ini["package.import"]
		if import_line == null then return null

		var map = import_line.parse_import
		if map.is_empty then return null

		return map
	end
src/loader.nit:1216,2--1227,4