Add issue templates (#551)

* Create bug.yaml

* Create feature.yaml

* Create config.yml

* Add DAW/host field

Also change version from placeholder to value so it is pre-filled

* Change OS field from dropdown to input

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Module request
+    url: https://github.com/DISTRHO/Cardinal/wiki/Possible-modules-to-include
+    about: To request a new module, add it to the wiki page here
+  - name: Discussions
+    url: https://github.com/DISTRHO/Cardinal/discussions
+    about: Ask other questions or share what you've made with Cardinal