Changes since: https://issues.apache.org/jira/browse/HARMONY-5912
-PermissionEditFormDialog is now complete (ok button handling, Permission string representation for the Permission LAE).
-All types of policy entry and Permission and Principal can produce its policy text representation.
-GraphicalEditorPanel can now produce the policy text of the graphically edited policy content
based on the policy representations of the policy entries.
The Graphical editor panel ===> Direct editor panel switching now carries through the policy text.
-I started the PolicyTextParser which is responsible to produce the policy entry list when loading a new policy file
and to parse the policy text when we switch from direct editor to graphical editor.
Not yet ready, but can already parse comment entries, keystore and keystore password url entries.
Grant entries are still to go.
-PolicyEntry model classes no longer contain the setText() method, its functionality is refactored to the PolicyTextParser.