`EpiCompare::EpiCompare`: Consider add `run_all` arg

[bschilder]

Consider adding a new arg (eg. run_all) that turns on all features/plot without having to specify each argument manually.

[bschilder]

eg. inside EPCompare

if(isTRUE(run_all)){
stat_plot = FALSE,
  chromHMM_plot <- chipseeker_plot <- enrichment_plot <- tss_plot <- TRUE 
}

[bschilder]

new arg added:

#' @param run_all Convenience argument that enables all plots/features
#' (without specifying each argument manually)
#'  by overriding the default values.