Refactor token parsing to keep data in a tree

Refactor token parsing to keep data in a tree of TokenItem objects.
For each data item the Claim type is stored.

Change-Id: I8bd33b51b7fb8ff86bfdce8ffe3c0c7f9bac5895
Signed-off-by: Mate Toth-Pal <mate.toth-pal@arm.com>
15 files changed