Build using custom config.json, add CSP, update to 0.1.53

roles/matrix-client-hydrogen/tasks/validate_config.yml

@@ -0,0 +1,9 @@
+---
+
+- name: Fail if required Hydrogen settings not defined
+  fail:
+    msg: >
+      You need to define a required configuration setting (`{{ item }}`) to use Hydrogen.
+  when: "vars[item] == '' or vars[item] is none"
+  with_items:
+    - "matrix_client_hydrogen_default_hs_url"