Retire fiji executable launchers

[ctrueden]

From a thread on the ImageJ mailing list:

Usually, I am starting Fiji with fiji-win64 launcher and that produces the error with 3D Viewer. I have tried the launcher you have mentioned - and after rather long start 3D Viewer did not through the error. Then I moved back to the stable version of ImagJ-win64 launcher (from March 2017) and it worked as well even faster than unstable version. So, I think the culprit is somehow connected with fiji-win64 launcher not imageJ-win64 launcher.

We want to have a single unified launcher per platform. The splash screen can show the Fiji logo in the corner of the splash screen so that people know it's still Fiji. Let's stop rewriting the icon. As for the title bar, perhaps we should add the major extension bundles like Fiji to the title bar in a more orderly way (e.g., if you have Fiji and BoneJ installed, it could say something like "ImageJ +Fiji +BoneJ"). Topic for discussion at the December hackathon.

See also #44, #53, #54.