Replace string parsing function from atol to StringToLong

int64_t on same architectures could be long int and on some others could be long long int
Merge pull request #347 from mhamrle/fix_convert_strings

Replace string parsing function from atol to StringToLong
mac path fix
Merge pull request #346 from da2ce7/oxs_path_fix

mac path fix
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
Moved Cmd header files to Cmd source folder