add morphisms for angle, temperature & real numbers

morphisms/temperature.morphism-base

@@ -0,0 +1,34 @@
+```
+```
+
+morph_celsius_to_kelvin ()
+      Temperature ~ Celsius ~ ℝ ~ native.Float
+-->   Temperature ~ Kelvin ~ ℝ ~ native.Float
+```
+    *dst = *src + 273.15;
+    return 0;
+```
+
+morph_kelvin_to_celsius ()
+      Temperature ~ Kelvin ~ ℝ ~ native.Float
+-->   Temperature ~ Celsius ~ ℝ ~ native.Float
+```
+    *dst = *src - 273.15;
+    return 0;
+```
+
+morph_celsius_to_fahrenheit ()
+      Temperature ~ Celsius ~ ℝ ~ native.Float
+-->   Temperature ~ Fahrenheit ~ ℝ ~ native.Float
+```
+    *dst = (*src * 9.0 / 5.0) + 32.0;
+    return 0;
+```
+
+morph_fahrenheit_to_celsius ()
+      Temperature ~ Fahrenheit ~ ℝ ~ native.Float
+-->   Temperature ~ Celsius ~ ℝ ~ native.Float
+```
+    *dst = (*src - 32.0) * 5.0 / 9.0;
+    return 0;
+```