Start shiny app to plot point verification

Usage

shiny_plot_point_verif(
  start_dir = NULL,
  full_dir_navigation = TRUE,
  theme = c("dark", "light", "white"),
  online = TRUE,
  ...
)

start_dir: The directory start the app in. The directory tree above this directory will not be visible.
full_dir_navigation: Whether to have full navigation of the directory tree below app_start_dir via a modal (TRUE - the default), or a dropdown selector of directories that contain harp point verification files (FALSE).
theme: The colour theme of the app - can be one of "dark", "light" or "white".
online: Logical. Whether the app should have access to the internet (e.g. to download fonts) or not.
...: Options to runApp.