fgasdia/RootsAndPoles.jl: Registered as RootsAndPoles.jl

This package is now officially registered and coincides with a name change from GRPF.jl to RootsAndPoles.jl.

As a v1.0.0 release, the package will be more strictly following semantic versioning from here out.

Major changes since v0.3.0 include:

• Performance improvements throughout. ~30% reduction in memory allocations and ~10% increase in speed.
• Interface change. tolerance, tess_sizehint, maxiterations, maxnodes, and skinnytriangle can now all be explicitly passed to the GRPF algorithm through the GRPFParams struct.