Change from Set to List backed multimap

See merge request ghsc/users/pmpowers/nshmp-lib!22

Switch runner

See merge request !411

fix broken MA05 interpolation

Closes #243

See merge request !410

Cleanup Alaska NGA-Sub bias correction

Closes #242

See merge request !409

consolidate Global interface AK bias correction coefficient into the GMM's main Coefficients class. This ensures the PGA correction is used for the PGA reference calc in the same manner as the other coefficients.

add PGA bias correction coeff into CoefficientsAkBias as temporary improvement, this will break tests

Update MA05 in PRVI subduction GMM groups

See merge request !408

add beta PRVI GMM groups

See merge request !407

KBCG_20 sigma update for Cascadia

See merge request !406

Nga east adjustment update

See merge request !405

Static method to parse gmm tree

See merge request !404

Beta implementation of Gomez 2022

Closes #232

See merge request !396

Max M for rate calc 9.4 --> 9.5

See merge request !403

Grid table focal mech update

Closes #237

See merge request !402