Removed unused case OTClient::issueAssetType.
Removed unused case OTClient::sendUserMessage.
Removed unused case OTClient::checkUser.
Merge pull request #334 from benma/ProcessUserCommand

Start removing dead code from OTClient::ProcessUserCommand.
opentxs CLI command separation.
Split into one class per command/function.
Removed unused parameters/functions
Fixed missing default case values
Replaced weird '\32' character with space in all files
Fixed formatting in OT_ME.cpp
Turned references into pointers to be able to compare to nullptr with clang
Moved all Cmd cpp and hpp to commands subfolder