64-bit Preference Pane for OSX

- will only run on Intel CPUs, OSX 10.5+
- replace JSON framework with more recent version supporting both 64 &
32 bits
- remove helper apps - backport new scripts from 10.0 instead

Change-Id: Ie1b085ca64f719158ee166ccac2dd1854ba894cd
Modify build script to create an OSX .pkg instead of .dmg file

Change-Id: Iacb419a203a872bed10bbc64eba131350257a2f6
The installer is no longer a zip file - no need to unzip

Change-Id: I9c081cb9a7221a71dfdfc7cc123ad054c7068bed
Include PreventStandby with OSX builds

Change-Id: I60fa595c99238a9f7833fd575d794cbd8adf346f
Don't include the revision number in OSX release builds

Change-Id: I95f7fe668374785ca69a5f505d55230d15aa09c6
Merge branch 'feature/7.7-64bit-prefpane-signed-installer' into public/7.7