Cast DWORD to guint32 when calling Log_Print()
Update NSIS installer script

Add a Makefile target for creating a Windows installer binary. Install
to a temporary DESTDIR and create the installer using the installed
data.
Do not show a command prompt on Windows
Update NEWS for Windows 2.1.9alpha1 release
Build resource and manifest into Windows binary

This adds some supplementary information into the binary, as well as the
icon.
Include missing icons in NSIS script

These icons come from the GNOME icon theme, and are the only ones
missing from the fallback hicolor theme.