ENH: 26482: Initial commit of OSX SDK Demo.
BUG 26482 Missing error directories on install
BUG: 24812: Unit test was no longer stopping because it was missing Stop() call.
BUG: OS X Demo would not work with more than two chunks of content.
BUG 26497 Unit test folder get_contents fix.

Unit test ut_session_maintainer did not work with changes for 1.2
folder/get_contents.
BUG: /usr/bin/env is much more common than /bin/env.
ENH: 26618: Added system/get_version to SDK.
BUG: Updated folder/get_content to match gen_api_template.py ouput.
ENH: 26618: Allow std::string into array types.
ENH: 26618: Added system/get_info to SDK.
26618: BUG: Fixed api array reading.

GetIfExists would only read child nodes, so added GetValueIfExists.
ENH: 26618: Added system/get_supported_media and system/get_editable_media to SDK.
ENH: 26618: Added system/get_mime_types to SDK.
ENH 26626 Convenience typedef
ENH HttpConfig add individual default headers

Simplify usage of HttpConfig by allowing adding default headers.
ENH: 26618: System APIs do not require session token.