map_ita_choropleth: Make a choropleth map of Italian provinces
In njhenry/covidemr: Tools for Mapping COVID Excess Mortality

Create a choropleth map for Italian provinces based on continuous input data by province

map_ita_choropleth(
  province_sf,
  region_sf,
  in_data,
  map_field,
  fill_list,
  fill_lims = NULL,
  titles_list = list(),
  fill_type = "continuous",
  show_legend = TRUE,
  labels_dt = NULL,
  save_fp = NULL,
  file_height = 7.25,
  file_width = 6
)

`province_sf`	[sf] Spatial object of provinces. Should have a 'location_code' field that will be matched to data
`region_sf`	[sf] Spatial object of regions. Will be added as an outline to map
`in_data`	[data.table] Dataset to be plotted. Should only include one row of data per province
`map_field`	[char] Field in 'in_data' to be mapped
`fill_list`	list of fill parameters that should be used, in the format of arguments to the 'scale_fill_<fill_type>'
`fill_lims`	[numeric, default NULL] Vector of upper and lower values for color scale.
`titles_list`	[default empty list] list of any titles that should be included, in the format of arguments to the ggplot 'labs' command
`fill_type`	[optional, default 'continuous'] Scale fill type eg. 'discrete' or 'continuous'
`show_legend`	Should the legend be featured on the plot?
`labels_dt`	[optional] Data.table used to label locations on the graph. Should be a data.table containing at least the fields 'label_name', 'x', 'y', 'x1_lseg', 'x2_lseg', 'y1_lseg', 'y2_lseg'
`save_fp`	[optional, default NULL] if not NULL (the default), saves to file rather than returning an object. If filled, should be a PNG extension
`file_height`	[optional, default 8] map height in inches
`file_width`	[optional, default 6] map width in inches