roads 1.1.0

• converted to using terra throughout the package. raster objects are still accepted but will be converted to terra formats.
• Added getDistFromSource function to use moving windows to quickly get a raster of the distance from the nearest source (e.g road).
• remove SpaDES.tools dependency because it is archived on CRAN and there is an equivalent method in terra now.
• The returned cost raster now includes the projected roads as having a cost of 0. This makes it easier to loop additional road building over time but is a change from the previous version where the input cost surface was returned.