proper setup smtp parameters as taken from IspDb

implement proper entity account

TestMailAccount is now testing the method toJson()

use account's smtp parameters to send emails

adding manual account creation

move saving of the account to the controller level

Check for autoload.php and tell the user to run composer if it's not found

also enable suggestions for cc/bcc, fix #167

adding an error message in case an account could not be loaded

Fixed css declaration and html for error message

Fix form layout

adding account name - pre-filled with user's display name

fixes #171

use base64 to encode the folder name as identifier

get user email from settings, fix #128

fix layout of add account box

New 3-column layout

- loading next message after delete

move new message button to sidebar, ref #118