Improve spell checker using codespell

* Configures automated spell checking with codespell
Adds GitHub workflows and configuration files for automated spell checking using `codespell`.

This includes:
- A workflow for checking pull requests and preventing new typos
- A workflow for automatically fixing typos in the main codebase
- Configuration files for `codespell` to ignore specific terms and file types
- Documentation on how to use and configure the spell checking workflows.

* Corrects minor spelling and grammar errors.

ApplicationLibCode/ProjectDataModel/RimTools.cpp

@@ -128,7 +128,7 @@ QString RimTools::relocateFile( const QString& originalFileName, const QString&
         }
     }
 
-    // Then find the possible move of a directory structure where projects and files referenced are moved in "paralell"
+    // Then find the possible move of a directory structure where projects and files referenced are moved in "parallel"
 
     QFileInfo   fileNameFileInfo( QDir::fromNativeSeparators( fileName ) );
     QString     fileNamePath         = fileNameFileInfo.path();