TypeObject parsing: union over enum case labels (#217)

* TypeObject parsing: union over enum case labels

This converts the plain integer case label in the TypeObject to an enum
symbol if the discriminator is an enum type.

Signed-off-by: Erik Boasson <eb@ilities.com>

* Only check for IdlEnum if discriminator is a class

Signed-off-by: Erik Boasson <eb@ilities.com>

* cyclonedds typeof: fix printing of bounded string

The IDL type is "string<N>" instead of "bounded_str<N>".

Signed-off-by: Erik Boasson <eb@ilities.com>

---------

Signed-off-by: Erik Boasson <eb@ilities.com>