Update docs and dependencies

[jmaspons]

Added missing osmdata_* functions, silicate as a suggested dependency and sp moved from imported to suggested

[mpadge]

Actually, moving sp to Suggests - which is a really great idea!! - then needs each function which actually uses it to first have:

requireNamespace ("sp")

Those 2 functions are

osmdata/R/elevation.R

Line 16 in 85cd695

osm_elevation <- function (dat, elev_file) {

and

osmdata/R/trim-osmdata.R

Line 63 in 85cd695

trim_osmdata_sfp <- function (dat, bb_poly, exclude = TRUE) {

The latter has an example of how it'd done here - initial lines at the very start of the function. Thanks

[mpadge]

@jmaspons Once you address the above, i'll happily approve and merge. I also wanted to arrange a video chat with you, mostly so that i can express my gratitude for all of your work. I don't have contact details for you, so can you please either email me, or you should be able to book a meeting at cal.com / markpadgham. Thanks.

[jmaspons]

Hopfully solved! I'll contact you, @mpadge . Let's find some day for next week

[jmaspons]

==> Rcpp::compileAttributes()

* Updated R/RcppExports.R
Warning message:
The following packages are referenced using Rcpp::depends attributes however are not listed in the Depends, Imports or LinkingTo fields of the package DESCRIPTION file: sp 

Perhaps it requires some more work to move sp to suggested packages

[mpadge]

Sorry, that's my fault. Just need to delete this line:

osmdata/src/osmdata-sp.cpp

Line 430 in 85cd695

// [[Rcpp::depends(sp)]]

That was just there for some historical reason I can no longer remember, but is no longer needed.

[mpadge]

Thanks @jmaspons. One more thing that generally needs to be done is to update the NEWS file. I'll merge for now and do that straight away, but we should both try to remember to always update NEWS with each PR 😀