Be more defensive when instantiating add-on class
Be more defensive when instantiating add-on class

Change AddOnLoaderUtils to also catch ExceptionInInitializerError when
instantiating the add-on class, to prevent it from propagating and
breaking other ZAP extensions/functionalities.

gmaran23/zaproxy,kingthorin/zaproxy,Ali-Razmjoo/zaproxy,kingthorin/zaproxy,zapbot/zaproxy,meitar/zaproxy,zapbot/zaproxy,Ali-Razmjoo/zaproxy,zapbot/zaproxy,zapbot/zaproxy,gmaran23/zaproxy,gmaran23/zaproxy,gmaran23/zaproxy,zaproxy/zaproxy,psiinon/zaproxy,meitar/zaproxy,psiinon/zaproxy,psiinon/zaproxy,thc202/zaproxy,zaproxy/zaproxy,thc202/zaproxy,thc202/zaproxy,zaproxy/zaproxy,psiinon/zaproxy,psiinon/zaproxy,kingthorin/zaproxy,gmaran23/zaproxy,zapbot/zaproxy,Ali-Razmjoo/zaproxy,meitar/zaproxy,zaproxy/zaproxy,meitar/zaproxy,thc202/zaproxy,meitar/zaproxy,kingthorin/zaproxy,zaproxy/zaproxy,zaproxy/zaproxy,meitar/zaproxy,zapbot/zaproxy,thc202/zaproxy,Ali-Razmjoo/zaproxy,Ali-Razmjoo/zaproxy,meitar/zaproxy,psiinon/zaproxy,zaproxy/zaproxy,gmaran23/zaproxy,Ali-Razmjoo/zaproxy,zapbot/zaproxy,kingthorin/zaproxy,thc202/zaproxy,kingthorin/zaproxy,kingthorin/zaproxy,Ali-Razmjoo/zaproxy,thc202/zaproxy,gmaran23/zaproxy,psiinon/zaproxy,meitar/zaproxy