New noisetypes

[behinger]

• realistic EEG Noise - maybe based on Artifacts.jl or DataDeps.jl so not everyone needs to download it. Currently discussing with @ReneSkukies how to do this
• Autocorrelated noise - @jschepers there was a paper we cite that had a nice noise-generator, do you remember?
• Exponential Noise - already implemented, but we should cap the exponential function at some point and apply it in batches or so
• Noise á la carte - implement the approach from Richard Gao on generating arbitrary complex signal-stubs from short segments (or generate data with their implementation and use Artifacts.jl to serve it)