Port turf-buffer

[1ec5]

Port turf-buffer as padded(by:).

[1ec5]

turf-buffer depends on a port of JSTS’s BufferOp. Turf.js has wanted to move away from JSTS for a long time, particularly turf-buffer: Turfjs/turf#88 Turfjs/turf-buffer#4 Turfjs/turf-buffer#33 Turfjs/turf#674.

[1ec5]

GEOSwift, which like JSTS is ultimately derived from the Java Topology Suite, has a buffering implementation available in Swift.

[almin1337]

Will buffer method soon be available for Swift (https://github.com/Turfjs/turf/tree/master/packages/turf-buffer)?