build: offer windows 64 bit build (issue #300)

* update to clang/llvm to 3.9
* update to qt 5.8
* fixed windows javapathdetector for 64 bit java.
* added LibGui as dependency to tests
* fixed legacy Java 6 install necessary on MacOS
* fixed setting of user path for 64 bit build
* added missing pngs to windows installer
* renamed graph zoom button images
* reverted moving of setupLogging call to fix crash on deployed exe

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setup/dynamic_libraries/win64/app/Debug/qt.conf

@@ -0,0 +1,2 @@
+[Platforms]
+WindowsArguments = fontengine=freetype