CTelegramStream: Fixed "End of generated operators" marker position.
Added session-restore WIP stuff.
CTelegramConnection: Improved InitConnection header insertion.
GeneratorNG: Since now tlType member will be added for every TLType.

This let us to store readed type (which can be RpcError).
TLTypes, CTelegramStream: Regenerated.
Refactored. Keep SDcInfo as only public API struct.

CTelegramConnection and Stream classes know nothing about SDcInfo,
but deals with TLDcOption instead.
CTelegramConnection: Refactored RpcResult processing.

Since now RpcResult processing based on caller method instead of
accepted TLValue.

This let us to generate some more code in future, as well, as use
much more stream operators right now.