secilc: Add support for unordered classes

Resolves https://github.com/SELinuxProject/cil/issues/3

An 'unordered' keyword provides the ability to append classes to the current
list of ordered classes. This allows users to not need knowledge of existing
classes when creating a class and fixes dependencies on classes when removing a
module. This enables userspace object managers with custom objects to be
modularized.

If a class is declared in both an unordered and ordered statement, then the
ordered statement will supercede the unordered declaration.

Example usage:

    ; Appends new_class to the existing list of classes
    (class new_class ())
    (classorder (unordered new_class))

Signed-off-by: Yuli Khodorkovskiy <ykhodorkovskiy@tresys.com>
Signed-off-by: James Carter <jwcart2@tycho.nsa.gov>
8 files changed