#606 update for NSIS2 mode

[Uwe]

Attached is a patch to update the nsis2 mode to NSIS 3.
Here is the list of the NSIS langeuage reference for the new keywaords I added in the patch:
http://nsis.sourceforge.net/Reference/!getdllversion
http://nsis.sourceforge.net/Reference/BGFont
http://nsis.sourceforge.net/Reference/ManifestDPIAware
http://nsis.sourceforge.net/Reference/ManifestSupportedOS
http://nsis.sourceforge.net/Reference/Unicode
http://nsis.sourceforge.net/Reference/VIFileVersion
I contributed in the past several times to the NSIS 2 mode thus you already have my license permission to include my patches.

[Uwe]

Attached is now also the patches nsis2.xml file

[Alan Ezust]

Committed rev 24789. Thanks!
In CHANGES.TXT, I credited you as "Uwe". Let me know if you'd like me to change that to something else.

[Alan Ezust]

oh I just found your name at the top of the file. Uwe Stöhr. I will fix the Changes.txt to say that.