Merge branch '2.2.x-config-edits' into '2.2.x-maint'

Added config for IMTs and updated model info for Vs30 presets

See merge request !38

calc-config.json

+{
+  "hazard": {
+    "imts": [ "PGA", "SA0P1", "SA0P2", "SA0P3", "SA0P5", "SA1P0", "SA2P0" ]
+  },
+  "performance": {
+    "distanceFilterUpdate": true
+  }
+}

model-info.json

 {
   "name": "NSHM Alaska 2007",
   "site-class-vs30": {
-    "AB": 1500,
-    "B": 1080,
-    "BC": 760,
-    "C": 530,
-    "CD": 365,
-    "D": 260,
-    "DE": 185,
-    "E": 150
+    "BC": 760
   },
   "bounds": {
     "min-latitude": 45.95,