added distinct vaccination/infection stages, immunization delay, and univariate figures showing more useful results with these changes

new output plots, alert mechanic bug fixed and mechanic changed to give alerts if coin flips exceed notification_threshold

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

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

PkgTemplates version: 0.7.13