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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cmake/setWinXxBits.cmake

@@ -0,0 +1,13 @@
+string(REGEX MATCH "64" MATCH_64 ${CMAKE_GENERATOR})
+
+if("${MATCH_64}" STREQUAL "64")
+	message(STATUS "Target is 64 bits")
+		if (WIN32)
+			set(WINXXBITS Win64)
+		endif(WIN32)
+else()
+	message(STATUS "Target is 32 bits")
+		if (WIN32)
+			set(WINXXBITS Win32)
+		endif(WIN32)
+endif()