Ported all process code from K3Process/K3ProcIO to KProcess based classes (see Process.h).

Removed a number of exported symbols that were breaking win32 builds (still compiles for me under linux, but feel free to re-expose them if anything breaks).

Amarok now builds with both MSVC (with a minor patch to plasma) and mingw under win32 (currently crashes in plasma on startup).

Should still be working under linux, the process stuff seems to work, but I've touched a few areas and there may be some breakage.