GO Contact Sync Mod Code

FIXED: https://sourceforge.net/p/googlesyncmod/bugs/1350/ Contacts Skipped Due to No Unique Property Found and skipping Photo Sync
FIXED? https://sourceforge.net/p/googlesyncmod/bugs/1347/ Possible explanation for a number of the reported issues - Google Limit of 1000 contacts, app showing that contacts were deleted that were not, contacts being duplicated, performance being slow, etc.

FIX: fixed object reference exception, see https://sourceforge.net/p/googlesyncmod/bugs/1352/
FIX: fixed startup delay from next sync + 5 minutes to only 5 minutes, see https://sourceforge.net/p/googlesyncmod/bugs/1325/

FIX: fixed the large body contact UnitTests
FIX: improved the handling of deleted recurrence exceptions

Added Info for using pre-release version.
Fixed some "Go People -> go contact"
Fixed NullReference on grups

Fixed Unit Tests

- ignore case when comparing strings

- added more debug output to RemoveGoogleDuplicatedContacts() to find "hanging/stops" problem
- check for contact photo, don't return profile photo
- added more debug output to multiple files

fixed GooglePeople API findings in UnitTests

fixed GooglePhoto default__ handling