sstFun - Estimating Stop Signal Reaction Times and Stop Signal Delay

Helper functions for estimating the SSRT (stop signal reaction time) in a Stop-Signal Task based on Verbruggen et al. (2019) <doi:10.7554/eLife.46323> and a mid-run estimates method for computing the mean SSD (stop signal delay) based on Levitt (1971) <doi:10.1121/1.1912375>.