proj_create() struggles

[mdsumner]

@paleolimbot I'm completely failing to get proj_create() to work, it crashes R - maybe it's obvious to you?

## should work like
.Call("proj_create_text", "+proj=longlat", 0L)

with this on the package side in libproj branch:

https://github.com/hypertidy/PROJ/blob/libproj/src/C_proj_create.c

I'm sure it's just me and C strings ...

[mdsumner]

hurrah not my fault haha

[mdsumner]

currently working with 'C_proj_crs_text' and exported 'proj_crs_text()'