A new Configuration class is added, which contains all information
that was previously set in various places.

This change
* removes a dummy \stdObject containing random information
* removes dependencies revolving around implicit dependencies in TSFE setup variables
* Centralizes all options regarding repository path

In addition, the tx_ter_api object does need any external dependencies
loaded from e.g. pi-based plugins anymore. This way, the next step is
to build a middleware for /ter and removing the plugin alltogether.