Fix eclipse compilation

[protoism]

After importing the project in Eclipse 2023-12:

• Eclipse is complaining about this dependency from com.atlassw.tools.eclipse.checkstyle.CheckstyleBuilder which seems to be not available anymore on the store
• Eclipse is complaining about some Jetty API, luckily in dead code (Jetty is currently provided by the Jetty SDK)

So....

• Rebuilt eclipse project files from maven
• Removed Jetty related dead code

As a matter of fact, it looks like there are quite a bit of versioned dependencies which are not needed anymore (entire com.gwtplugins.gdt.eclipse.apiclientlib). Next PR...

[protoism]

@niloc132 Please approve. I'd consider disabling approval altogether