Move to using multiple issue and PR templates (#1584)

.github/PULL_REQUEST_TEMPLATE/enhancement.md

@@ -0,0 +1,20 @@
+# Enhancement request
+
+<!--
+To be used for PRs which enhance existing features
+-->
+
+#### Describe the enhancement
+
+<!--
+Describe what your changes do.
+If adding commands, describe any restrictions on their usage.
+  - For example, who can use the command? Where can it be used?
+-->
+
+#### Does this enhancement break existing functionality?
+
+<!-- To check a box, replace the space between the [] with a x -->
+
+- [ ] Yes
+- [ ] No