[Gtkradiant] First 1.6.6 build

[Timothee Besset]

Hey everyone,

First 1.6.6 build:

https://s3.amazonaws.com/gtkradiant/GtkRadiant-1.6.6-20180122.zip

Probably pretty rough. Highlight of the changes:

   - FreeBSD support (Thomas Debesse)
   - Switched Windows project files to Visual Studio 15 (2017)
   - Integrated the Quake 1 support that was half finished previously
   - Merged patches to support Unvanquished
   - Refactor code to use flexible array members (Thomas Koppe)
   - Misc rare memory corruption crashes and bug fixes

Not going to push this one to the website yet, it may need a new runtime,
and there's probably a few more iterations on this build to do.

TTimo
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