[FEATURE] Use sitetile from sys_template as sitename

As we are going to create a root template, we will use it's
sitetitle field for setting it in the frontend.

At the same time, the field is set as required in TCA
[TASK] Change ext_icon.gif to FDF logo
[TASK] Rename "Menu" to "Navigation"
[TASK] Set sitetitle as required in TCA
[TASK] Add FDF logo to base package
[TASK] Move TSConfig to file and include in ext_localconf.php