Adapt to GlassFish 7.1, 8.0

[bvfalcon]

Closes #6

[OndroMih]

Hi, @bvfalcon , thank you for this. We're working on some other improvements on the Eclipse IDE plugin in parallel. We'll synchronize the changes soon and then we'll review and merge this PR and raise another PR with our changes.

Since this repository isn't in Eclipse foundation, would you grant us copyright to all your changes in this pull request so that we don't have to introduce another copyright holder in this repository? If yes, simply answer with a sentence like:

"Hereby I grant copyright to the code and changes contributed in this pull request to OmniFish OU based in Estonia."

[bvfalcon]

Yes, sure: "Hereby I grant copyright to the code and changes contributed in this pull request to OmniFish OU based in Estonia."

For me the main thing is, that plugin remain actual and usable with latest Servers versions. This makes programming easier.