* Refactor property lists member function for WriteProperty default case.
* Refactor time-value object unit testing
* Added test for unsupported property to common property test
* Added dependent BACnet stack headers into bacdef.h file.
* Changed bacdef.h and other stack includes in c/h files to have a common pattern.
* Moved bits.h, bytes.h, and bacnet_stack_exports.h under bacnet/basic/sys/ folder.
* Added Keylist_Data_Free function to free all nodes and data in a list
* Added basic Life Safety Zone object type in the apps/server example, with unit testing.
Steve Karg