Merge branch 'grid-focal-mechs-237' into 'main'

gradle/wrapper/gradle-wrapper.jar

gradlew

src/main/java/gov/usgs/earthquake/nshmp/calc/CalcConfig.java

...main/java/gov/usgs/earthquake/nshmp/calc/HazardCalcs.java

...java/gov/usgs/earthquake/nshmp/model/FaultRuptureSet.java

.../java/gov/usgs/earthquake/nshmp/model/GridRuptureSet.java

...ain/java/gov/usgs/earthquake/nshmp/model/ModelLoader.java

...va/gov/usgs/earthquake/nshmp/model/PointSourceFinite.java

src/main/resources/calc/calc-config-defaults.json

.../java/gov/usgs/earthquake/nshmp/calc/CalcConfigTests.java

src/test/resources/calc/calc-config-extends.json

src/test/resources/model/test-model/calc-config.json