Make the executable a real Windows GUI application

Make a real Windows application, with a Windows icon embedded.

Change-Id: Ie29017ddd89796352929bae88bd86c4aa519d963
Customize CPack a little, get NSIS working

We want CPack to use our version, rather than the default 0.1.1, add
the license file and icon setup along with some useful links once
everything is installed.

Change-Id: Icbcd16d7a63e967b84f8c981289bbad86a4a37e7
Minor cleanup for Mac packaging

Change-Id: I957c1dba961ee45568bf7f0898a49baf330c6c57
More tweaks to packaging, install Python files for generators

Change-Id: I322736233bad968e5a883a344e083ed167c45ff0
Merge topic 'windows-packaging' into master

18c94585 More tweaks to packaging, install Python files for generators
bfae2904 Minor cleanup for Mac packaging
004d1b78 Customize CPack a little, get NSIS working
7c5ef795 Make the executable a real Windows GUI application