372044: [user]:  New feature to transfer anomalies between review items
https://bugs.eclipse.org/bugs/show_bug.cgi?id=372044

- Completed implementation for comparing 2 review items with each other
with full annotation support
- Added code to prevent adding review items/anomalies to the right side
of the compare editor (for now)
- Added test code
- Added help documentation

Change-Id: Ic54313c386f7af03402e4ab546f85ceba42ac200
41 files changed