Trigger config python access
Implement python access to trigger configuration
Provides access to the L1 and HLT menus and prescale-sets and to the HLT job options. Missing is the bunchgroup access, although all the infrastructure exists
For each type of configuration one access class exists, which can be called with a file name or at trigger alias and db-key
The class holds an order-preserving dictionary of the configuration data, which can be accessed directly. Convenience functions for commonly used data exist.
An executable has been added to make use of this functionality
Partially addresses ATR-20884.