Convert C -> C++

In order to make life better, convert all C code to C++.  This allows
us to use Qt functions to write out values.
byteswap: Use internal byteswap routines

This allows us to be more portable.
import: Use Qt commands for file management

As part of the Windows-compatible port, don't use read()/lseek()/
write() directly.  Instead, use Qt QFile commands.
qhexedit: Initial patches for Qt 5 compatibility

More files need to be included.