Change the priority of the categorization

[gzsombor]

• if marked with custom
• if we have the source file - a test/prod code
• platform code
• synthetic methods
• library code
• unknown

What it does

Fixes #658

How to test

Debug the following code:

public class Bug {
	public static void main(String[] args) {
		var in = new Inner(m -> {
			System.out.println("hello " + m); /// breakpoint here
		});
		for (int i = 0; i < 3; i++) {
			in.innerCall("world " + i);
		}
	}

	record Inner(Consumer<String> li) {
		void innerCall(String msg) {
			li.accept(msg);
		}
	}
}

Check that the stack frames are sensible and correctly displayed

Author checklist

• I have thoroughly tested my changes
• The change is following the coding conventions
• I have signed the Eclipse Contributor Agreement (ECA)

[iloveeclipse]

@gzsombor : could you add tests for the stack frames categorization to cover known expectations? The change looks fine for this concrete use case, but honestly speaking, it might cause regressions in other use cases I didn't tested manually, and without tests we would only know about regression after someone reports that in the released version.

[gzsombor]

There are tests in #81 and I had to modify it due this change. It's not much but touches enough relevant code IMHO.