Tame Gradle Project Loading

[lkishalmi]

@sdedic this is an attempt to tame the Gradle project loading methods and calls. My motivation was, that I started to get lost in the calls when a Gradle project, loaded re-loaded.

What I'm trying here is to move the options of the different kind of re-loads into a separate class as GradleLoadOptions so the code can be more descriptive, and the usage of certain load flags could be more easily tracked. I could be completely wrong with this PR and my approach could be wrong as well. Your feedback is essential.

I've tried not to break things, though made a few not compatible changes. loadedProjectSerial and currentSerial in NBGradleProjectImpl were moved to a new sequence field to GradleProject, so dumpProject() cannot set the loadedProjectSerial to zero.

Tests seems to be fine, save NbGradleProjectImpl.testEventsProcessedBeforeCompletion() which hangs in infinite wait. Unfortunately I could not crack what that test really does, so I need some help there.

There are some unused code mentioning GradleLoadContext that shall be ignored.

I have purposefully not changed the javadoc on the load methods yet, so the former parameters can be looked up while replacing the calls with GradleLoadOptions arguments.

[sdedic]

ok to review now, or is it still being overhauled (it's marked as wip) ?

[lkishalmi]

Marked as wip, as this is still in a draft, "let's talk about it" phase.