Add colorbar entries for more standard names

Adds entries for:
 * air_temperature
 * pressure
 * relative_humidity
 * wind_speed_of_gust

cset-workflow/extra-meta/colorbar_dict_alphabetical.json

@@ -8,6 +8,11 @@
     "max": 104000,
     "min": 96000
   },
+  "air_temperature": {
+    "cmap": "jet",
+    "max": 320,
+    "min": 260
+  },
   "atmosphere_mass_content_of_cloud_ice": {
     "max": 0.5,
     "min": 0.0
@@ -116,14 +121,23 @@
     "max": 30.0,
     "min": -30.0
   },
+  "pressure": {
+    "max": 104000,
+    "min": 96000
+  },
   "radar_reflectivity_at_1km_above_the_surface": {
     "max": 50.0,
     "min": -50.0
   },
+  "relative_humidity": {
+    "cmap": "YlGnBu",
+    "max": 120,
+    "min": 20
+  },
   "relative_humidity_at_screen_level": {
     "cmap": "YlGnBu",
-    "max": 105.0,
-    "min": 30.0
+    "max": 120,
+    "min": 20
   },
   "surface_downward_longwave_flux": {
     "max": 450,
@@ -234,5 +248,9 @@
   "wind_speed_at_10m": {
     "max": 30.0,
     "min": 0.0
+  },
+  "wind_speed_of_gust": {
+    "max": 60,
+    "min": 0
   }
 }