Replace Pipewire with PipeWire for consistency

And set up a CI job to check for that.

.gitlab-ci.yml

@@ -260,6 +260,14 @@ shellcheck:
   script:
     - shellcheck $(git grep -l "#\!/.*bin/.*sh")
 
+spellcheck:
+  extends:
+    - .build_on_fedora
+  stage: analysis
+  script:
+    - git ls-files | grep -v .gitlab-ci.yml | xargs -d '\n' sed -i 's/Pipewire/PipeWire/g'
+    - git diff --exit-code || (echo "Please fix the above spelling mistakes" && exit 1)
+
 pages:
   extends:
     - .not_coverity