general: use codespell to identify spelling mistakes

.codespellrc

@@ -0,0 +1,3 @@
+[codespell]
+skip = ./.git,./build,./dist,./Doxyfile,./externals,./LICENSES
+ignore-words-list = aci,allright,ba,deques,froms,hda,inout,lod,masia,nax,nd,pullrequests,pullrequest,te,transfered,unstall,uscaled,zink

.github/workflows/codespell.yml

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+# GitHub Action to automate the identification of common misspellings in text files.
+# https://github.com/codespell-project/actions-codespell
+# https://github.com/codespell-project/codespell
+name: codespell
+on: pull_request
+permissions: {}
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          persist-credentials: false
+      - uses: codespell-project/actions-codespell@master