Moved config into $GLOBALS
Moved request_uri into $GLOBALS
Modified all files accordingly
Modified logout page for future improvements (not deleting the entire $_SESSION)
Fixed LICENSEs, moved LICENSE for PHP files in /lib/php subfolder instead of /lib
Moved PHP files to "lib" folder
Moved Javascript files to "lib" folder
Moved login page inline CSS to "login.css"
Moved database functions to class "Database"
Removed the html template, compensated with a direct HTML code inside PHP "else" statement
Moved database function in class "Database";
Corrected database-using webpages accordingly;
Moved config file from PHP to JSON with more config variables;
Corrected login page redirection on wrong username or password.
