[Podfile] Bump deployment target to iOS 10.0 and remove MatrixSDK/JingleCallStack subspec from app extension.
[Podfile] Bump deployment target to iOS 10.0 and remove MatrixSDK/JingleCallStack subspec from app extension.

vector-im/vector-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios