Fix

it fixes following case

public class Test {
    public void test() {
        new Delegate();
    }
    private static class Delegate implements NSObjectProtocol {
        
    }
}

causes compilation warning:

ObjCProtocol to NSObject failed: too many public constructors

and runtime crash if this class is used as NSObjectProtocol with ObjC:

Delegate cannot be cast to org.robovm.objc.ObjCObject at org.robovm.objc.ObjCObject$Marshaler.protocolToNative

Promoter was working only in case one constructor is present.

But in case of private classes there is additional synthetic public constructor is created. Code updated to ignore synthetic constructors and allow multiple constructors to be available

Inspection

Added Intellij Idea ispections to highlight following cases:

• if class implements NSObjectProtocol and extends java.lang.Object -- warning with quick fix to extend from NSObject (actually this class will be promoted)
• if class extends some class that implements NSObjectProtocol and extends java.lang.Object -- warning for both classes and quick fix to navigate to supper that can be updated with NSObject super.
• if class implements protocol but extends class that has some hierarchy behind -- mark as error as this class will not be handled by promoter and will cause Runtime crash