Change: include fmt.h C++ headers in stdafx.h

This to prevent compilation issues between runs with and without precompiled
headers. Also remove the headers from the rest of the code base as they are
not needed there anymore, although they do relatively little harm.

(svn r15291) -Cleanup: Move the station list widgets to their class from station_gui.h
-Fix: comment for ReallocT was wrong, the memory is not zeroed.

(svn r11990) -Codechange: Show all cargo sources (en-route from) in the station view
cargo waiting list instead of just one. The station view window is now
resizable to cope with the extra information.