convert logicals to integers

[wibeasley]

Add a parameter to redcap_write_oneshot() and redcap_write() called convert_logical_to_integer.

Any logical/boolean value will be converted to an integer, so it meshes well with T/F and Y/N items that are coded as 1/0 underneath. The default will be FALSE, so it doesn't break existing code.

Currently, our team uses code like this before uploading.

ds <- 
  ds %>%
  dplyr::mutate_if(is.logical, as.integer)