Favourites Engine API: Changes

The following header file(s) have changed between 3.0 and 3.1

**Table 1:** favouriteslimits.h
Type	Class	Change
New constant		`const TInt KFavouritesSavedDeckItemUid`

The following header file(s) have changed between 3.1 and 3.2

**Table 2:** favouriteslimits.h
Type	Class	Change
New constant		`LOCAL_C const TInt32 KFavouritesFeedsContextId`