Toolkit should accept command line arguments for finetuning

Note: This is a minor feature suggestion. Something which should be done on the long term to improve the users daily life. It is not important right now

Currently, the toolkit has a way of overwriting some files always while creating some files only if they do not yet exist.

Sometimes, especially when the API or toolkit changes, one needs to recreate everything. The typical workflow is then to call rm Abstract*Solver* KernelCalls*. Instead, it would be nice if the toolkit supports some option --overwrite or similar to always recreate the files. It could also offer an option --compare to print whether generated files differ from existing files.