#53 Additional tests and fixes for attacks and libraries

This adds several additional testcases for EternalBlue, Joomla and SqliAttack because we only had a default testcase for these attacks. This also fixes some crashes with get_nth_element and adds testcases for these scenarios. This also replaces 3 portscan testcases, which used mock, with 1 testcase which avoids mocking because it covers the same situations. (Having 3 testcases was unnecessary)