remove declarations of unimplemented methods
remove declarations of unimplemented methods

This patch should not be regarded as API/ABI incompatibility since these methods have never been implemented according to the git history.

utkuaydin/marble,quannt24/marble,David-Gil/marble-dev,oberluz/marble,AndreiDuma/marble,Earthwings/marble,rku/marble,tzapzoor/marble,AndreiDuma/marble,quannt24/marble,probonopd/marble,quannt24/marble,tzapzoor/marble,David-Gil/marble-dev,David-Gil/marble-dev,tzapzoor/marble,rku/marble,oberluz/marble,adraghici/marble,adraghici/marble,utkuaydin/marble,tucnak/marble,David-Gil/marble-dev,tzapzoor/marble,utkuaydin/marble,tucnak/marble,oberluz/marble,David-Gil/marble-dev,rku/marble,probonopd/marble,oberluz/marble,quannt24/marble,AndreiDuma/marble,tzapzoor/marble,tzapzoor/marble,utkuaydin/marble,Earthwings/marble,adraghici/marble,AndreiDuma/marble,probonopd/marble,adraghici/marble,quannt24/marble,rku/marble,oberluz/marble,Earthwings/marble,Earthwings/marble,tucnak/marble,utkuaydin/marble,quannt24/marble,David-Gil/marble-dev,tucnak/marble,rku/marble,tucnak/marble,oberluz/marble,quannt24/marble,tzapzoor/marble,tucnak/marble,AndreiDuma/marble,utkuaydin/marble,tzapzoor/marble,adraghici/marble,Earthwings/marble,probonopd/marble,rku/marble,AndreiDuma/marble,probonopd/marble,Earthwings/marble,adraghici/marble,probonopd/marble,probonopd/marble,tucnak/marble