Qgym

Bugfixes:
- Trunctation of `InitialMapping` truncation now works as expected.
- Grid graphs are now parsed correctly.

This release includes major improvements for the `Routing` environment and some minor changes to the `InitialMapping` environment.

Routing
- The action space of the `Routing` environment is changed to a simple discrete space. Every entry now represents a legal swap or a (possibly illegal) surpass. This is a *breaking change*.
- The `Routing` environment can now handle graphs with fidelity. The `Rewarders` are not changed an thus do not take any fidelity into account. Nonetheless, custom `Rewarders` now can use the fidelity.

InitialMapping
- The `FidelityRewarder` of `InitialMapping` has been removed. Instead the other rewarders take fidelity into account automatically when the connection graph has weights representing the fidelity.
- `InitialMapping` now truncates an episode if the number of steps exceeds 10 times the number of nodes in the connection graph.

Bugfixes
- Bugfix in the `Visualizer` that would sometimes crash an environment upon deletion.

This release adds the possibility to (optionally) add fidelity to the connection graph of ``InitalMapping`` environment. It also contains some improvements to the documentation and some minor bugfixes.

Initial release of `qgym`.

This version contains the `InitialMapping`, `Scheduling` and `Routing` environments as well a some templates which can be used to extend the framework.