HML Checker

Add "Load Categories From" to the file menu and the Ctrl+Shift+O shortcut. Associate the controls with the system default open file dialog.

Then implement code to read the file, for CSV/TXT it will look for a columns called "ID", "ParentID", "Category", and "Sort Order" to fill in information for generating the Category table (it will also export these same fields when they're exported). XLSX files will have the categories loaded from a "Categories" worksheet when the project is opened or created/saved.

Column names will be validated for invalid characters and highlighted in red. (Forward slash and comma)