pySim has been using magic numbers to access various files which makes it hard
to read, maintain and extend. With this file in place we can start replacing all
those magic numbers with human readable names lile EF['IMSI'] instead of
['3F00', '7F20', '6F07'].
Change-Id: I38f5d36d16b41b5d516a6a3e2ec1d09637883932