Conventions do not get applied to custom test tasks

[rkrisztian]

If I create a SoapUI test task of type TestTask, I expect that the conventions get applied to those tasks too. Currently that does not happen, thus I have to redeclare everything I already set by default in the soapui.test extension. Because the method that takes care of what I need is private in the plugin code, I cannot even reuse it.

Please also initialize extension properties designed to hold arrays with empty arrays so that we can just add values without having to remember whether the property is still null or not.

[daggerok]

I think project not in a maintenance mode...

@willis7 are you planning finish it’s transfer?