64bit types defined as long long are incorrect in 64bit platforms

[GoogleCodeExporter]

long long doesn't have a defined size only double of a long which in 64bit 
platforms seems to be 128.

both osc::int64 and osc::uint64 should be defined as int64_t and uint64_t 
otherwise their size is incorrect in some platforms and might lead to errors 
when reading them from other software.

see also: https://github.com/openframeworks/openFrameworks/issues/3859

Original issue reported on code.google.com by [email protected] on 22 May 2015 at 7:29