[reSIProcate] v1.9 and fixed-size integer types (UInt32, uint32_t, etc)

[Daniel Pocock]

I'm not sure if all the fixed-size integer stuff should be merged in for
v1.9

However, I feel it is a good idea to start using it for Data, because
some of the methods expect certain sizes anyway

I've made some small updates for this and it means that the Data.hxx API
has changed slightly, the Data(unsigned long) constructor is gone and
now you have to use Data(Int32), Data(UInt32) or Data(UInt64).

Regards,

Daniel