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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bin/app/data/install/uninstall_wix.bat

@@ -1 +0,0 @@
-%windir%\system32\msiexec.exe /x {92dd6ab1-78b3-49a7-aa33-338964c20969}

bin/app/data/install/uninstall_wix_win32.bat

@@ -0,0 +1 @@
+%windir%\system32\msiexec.exe /x {a2c6d195-ac5c-4ba4-b26b-93a057254a06}

bin/app/data/install/uninstall_wix_win64.bat

@@ -0,0 +1 @@
+%windir%\system32\msiexec.exe /x {6931fab2-7683-421a-ac7e-9d26b8ca123e}