Big security update with improved favicon handling

The password manager component has some security improvements like generating random numbers using OpenSLL if available and using a more secure password hashing algorithm.

It is recommended to run the following cli tool to update the server key for all password:

php cli/run_cli.php --cli=Caco\\Password\\CLI\\ChangeServerKey -f YOUR_OLD_KEY -t A_NEW_KEY

All icons gets stored in the sqlite database now, for importing the favicon files run the following script when upgrading from a previous version:

php cli/run_cli.php --cli=Caco\\Upgrade\\CLI\\From2To3