Make all api v2 calls in core call v2 explicitly & remove v2 support from wrapper

For a brief period we tried supporting v2 api calls via the api wrapper - we reverted out of this but unfortunately in the meantime a load of calls to v2 api were changed to use the wrapper. While it would be ideal to remove the v2 calls from core completely this requires testing of each function - this ticket is specifically to ensure that the remaining v2 api calls call the functions directly & do not interact with the wrapper layer (which will create unpredictable results & make it harder to identify & elimate v2 calls). We also want to remove the v2 support code as it is not tested