Rc0.4.5 (#144)

* Feat/better defaults (#142)

Updates:
* Modularisation of SwyftModule
* Restructuring of `configure_optimizers` and `configure_callbacks`
* New default is AdamW with early stopping
* Alternatives with AdamW and OneCycleLR and ReduceLROnPlateau exist as well
* Automatic reloading of best model at the end of training is default

* Feat/plot cleanup (#138)

Updates:
* Remove plot2.
* Extended options
* Add `smooth_prior` flag for interpolating likelihoods
* Renaming of plotting routines (plot_posterior, plot_corner, plot_pair)
* Update example notebook

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Co-authored-by: NoemiAM <noemi.anaumontel@gmail.com>

Author: cweniger