Gcs standardize qint

GCS was using a mixture of stdint but much more commonly the Qt integer types (qint32 etc).
Actually the only real place stdint was being used was the SSP library that is used by some
experimental code and the uploader, so really just in an external library. Having a mixture of 
standards isn't very good coding practice, so this converts all the stdint to Qt types. External
libraries were not altered though.

Lots of LOC but shouldn't be any functional changes.