Refactor `proj_create*` calls.

georust / proj

Rust bindings for the latest stable release of PROJ

https://docs.rs/proj

Apache License 2.0

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Closed frewsxcv closed 2 years ago

frewsxcv commented 2 years ago

Create an Errno struct to wrap an errno result from PROJ C calls
Extract pointer logic from proj_create* calls into result_from_create function
Assume PROJ will always give us valid string errors– panic if PROJ doesn't and remove ProjErrorMessageUtf8Error, panic