[Gtkradiant] Updated 1.6.6 build

[Timothee Besset]

https://s3.amazonaws.com/GtkRadiant/GtkRadiant-1.6.6-20180422.zip

Changes since last update:

   - A fairly large set of small changes that brings GtkRadiant and
   NetRadiant's q3map2 on a common base of code. There are still differences
   between the two compilers but this change makes it easier to transfer
   changes back and forth. See https://github.com/TTimo/GtkRadiant/pull/605
   for details. Credits to Thomas Debesse for all the work there.
   - Import minimap feature from NetRadiant's q3map2 (also Thomas Debesse)
   - More general stability fixes to q3map2 (Thomas Köppe)
   - Allow negative light values
   - Several fixes for Quetoo and idTech2 surface inspector (see
   https://github.com/TTimo/GtkRadiant/pull/613)
   - Make q3map2 sort the paks same way the engine does

TTimo
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