Github: Create codespell workflow and codespellignore

.github/codespellignore

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+aci
+ake
+aline
+alle
+alledges
+alocation
+als
+ang
+anid
+apoints
+ba
+beginn
+behaviour
+bloaded
+bottome
+byteorder
+calculater
+cancelled
+cancelling
+cas
+cascade
+centimetre
+childrens
+childs
+colour
+colours
+commen
+connexion
+currenty
+dof
+doubleclick
+dum
+eiter
+elemente
+ende
+feld
+finde
+findf
+freez
+hist
+iff
+indicies
+initialisation
+initialise
+initialised
+initialises
+initialisiert
+inout
+ist
+kilometre
+lod
+mantatory
+methode
+metres
+millimetre
+modell
+nd
+noe
+normale
+normaly
+nto
+numer
+oder
+ontop
+orgin
+orginx
+orginy
+ot
+pard
+parm
+parms
+pres
+programm
+que
+recurrance
+rougly
+seperator
+serie
+sinc
+strack
+substraction
+te
+thist
+thru
+tread
+uint
+unter
+vertexes
+wallthickness
+whitespaces

.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:
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Get changed files
+      id: changed-files
+      uses: tj-actions/changed-files@v12.2
+
+    - name: List all changed files
+      run: |
+        for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
+          echo "$file was changed"
+        done
+
+    - uses: codespell-project/actions-codespell@master
+      with:
+        check_filenames: true
+        ignore_words_file: .github/codespellignore
+        skip: ./.git,*.po,*.ts,./ChangeLog.txt,./src/3rdParty,./src/Mod/Assembly/App/opendcm,./src/CXX,./src/zipios++,./src/Base/swig*,./src/Mod/Robot/App/kdl_cp,./src/Mod/Import/App/SCL,./src/WindowsInstaller,./src/Doc/FreeCAD.uml,./build/
+        path: ${{ steps.changed-files.outputs.all_changed_files }}