Deferred remote execution

processing issues https://git.scc.kit.edu/virtmat-tools/vre-language/-/issues/6 and https://git.scc.kit.edu/virtmat-tools/vre-language/-/issues/23

Completely implemented:

• implementation-strategy-for-the-firetaskfirework-construction
• optimal-wrapping-python-functions-into-firetasks

NOTE: Constants (such as metamodel object attributes from terminal rules) are "passed" within closures i.e. they are captured from the outer scope of the function and not passed as arguments. Much better would be to have these constants as keyword arguments in the function. For this, the function tuple has to be extended with a third element: (function, args, kwargs)

Not implemented:

• provide-the-source-code-to-the-interpreter
• provide-a-program-instance-to-the-interpreter
• use-directives-to-manipulate-_tx_model_params
• io-operations-in-deferred-remote-evaluation
• task-node-and-data-granularity