moved static part of backend config to config/config.php as it is not
automatically generated anymore.
whitespace changes and removed obsolete comment line.
whitespaces and added a missing semicolon in language file.
Removed if(defined('TL_ROOT')) { ... } preventing direct access to files.
remove all trailing ?> on EOF.
Contao 3 compatibility.
removed obsolete method TableMetaModelRenderSettings::getLanguages()
refactored table existance to new static method isDBInitialized()
as we need it in multiple places.
Merge branch 'master' into contao-3

Conflicts:
	src/system/modules/metamodels/MetaModelBackend.php
	src/system/modules/metamodels/TableMetaModelRenderSettings.php
some more fixes for contao 3. many left though.
allow popup.php to be called via .htaccess.
Fix Template selection for Contao3
fixed the improper return value of null to empty array which caused warnings.