add univariate snensitivity plots, some output code, added the model size and length to parameter tuple. New output is in /CovidAlertVaccinationModel/plots/univariate

added tests to ZeroWeightedDistributions, removed vector rand function cause it was wrong, but we don't use it in the simulations anyway

merge IntervalsModel into CovidAlertVaccinationModel, dependecies are too tight to manage as too packages easily

removed LTC/HCW stuff, contact generation needs fixing, use bytearrays instead of bitarrays for weights

Seperated Zeroweighteddistributions into its own package, implemented WS/Rest functions, although fitting doesn't work too well yet