Modernize ApplicationConfiguration
Add types to properties
Add property $name explicitly
This fixes the following issue:
PHP Deprecated:
Creation of dynamic property ApplicationConfiguration::$name is deprecated
in /var/51-wwwroot/obsidian/workspaces/src/Engines/Apps/ApplicationConfiguration.php on line 66
Following style conventions for class end
Differential Revision: https://devcentral.nasqueron.org/D3827