* 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.
* Updated keylist to use bool and stdint value for key not found.
* Added Keylist_Index_Key to deprecate Keylist_Key function
* Changed the deprecated Keylist_Key API to Keylist_Index_Key
* Added unit test for Keylist_Index_Key API
* Added basic Calendar object, unit tests, and integration with example device object.
* Added basic Time Value object, unit tests, and integration with example device object.
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Co-authored-by: Steve Karg <skarg@users.sourceforge.net>
Steve Karg