#40 feat: adding mysql connect as injection, feat: implementing in memory database for tests, move fltrail.sql to test/resources/database, so it can be used in test for building the inmemory database

#40 moving fltrail.sql script to test resource folder to use it automatically for test database creation

feat: implemented Servlet Filter (for all pages in /pages/ user is redirected to login if he is not authorized)
feat: implemented TagLib for hidden fields (showing the user name based on token in url)
feat: copied styles from groupfinding project