prepInputs and downloadData -- now moved to SpaDES.tools

[Eliot McIntire]

prepInputs and downloadData and several of their helper/internal functions have been moved out of SpaDES.core and into SpaDES.tools. 

This may or may not affect people. If a project was already loading SpaDES.tools (if the project was using spread, spread2, randomPolygon etc.), then it will have no effect. The solution to "couldn't find function prepInputs" is: library(SpaDES.tools)

This also caused downloadData and a few helper functions to be moved to SpaDES.tools, which may affect situations where downloadData was run manually, but will not affect situations where downloadModule(..., data = TRUE) was run.

Apologies for the inconvenience; it is the more natural place for these two functions. It is not really easy to officially deprecate the function because it still retains the same name. Similarly, adding SpaDES.tools to depends did not seem like the best solution (though this is open for comment).