Switched to new javadoc viewer

[Rylern]

When using the new Javadoc viewer within QuPath, the redirection issue described on #1513 (comment) still happens. I'm going to see how to fix this.

[Rylern]

When using the new Javadoc viewer within QuPath, the redirection issue described on #1513 (comment) still happens. I'm going to see how to fix this.

Fixed in the last commit

[petebankhead]

What's the correct way to run this?

I tried

./gradlew clean assembleJavadocs run

but I'm seeing

No javadocs could be found - sorry!

(in a serif font that really ought to be sans-serif)

[Rylern]

I only checked that the Javadocs were found when creating a jpackage. The logic to find Javadocs around the executable is present in the javadoc-viewer library, so when running QuPath with Intellij, it searches around the javadoc-viewer library, not around the QuPath executable. I will move this logic from the javadoc-viewer library to QuPath.

(in a serif font that really ought to be sans-serif)

I forgot to link the QuPath stylesheet to the WebView, I'll also add this.

[Rylern]

I fixed the two things. I updated the javadoc-viewer snapshot on maven.scijava.org so Intellij might not directly see it.

[petebankhead]

Just one small comment on the missing copyright at the top of a file