HPCC-8631 Added library for dynamic apr access

Dynamic loading of apr is done by including the dynapr lib
and then creating an object or using newAprObject() followed
by a call to init().

This is designed to be instantiated and then used allowing for
init to prepare the object for use and the deconstructor to
clean up after the object.

Signed-off-by: Philip Schwartz <philip.schwartz@lexisnexis.com>