error: value "GameTool" for key "Categories" in group "Desktop Entry" contains an unregistered value "GameTool"

`GameTool` is part of the spec here: https://specifications.freedesktop.org/menu/latest/additional-category-registry.html

```ini
# https://specifications.freedesktop.org/desktop-entry/latest/recognized-keys.html
[Desktop Entry]
Type=Application
Name=AutoSplit
GenericName=Speedrun Auto-Splitter
Comment=Image comparison based auto splitter for speedrunning
Icon=AutoSplit
Exec=AutoSplit
# https://specifications.freedesktop.org/menu/latest/category-registry.html
# https://specifications.freedesktop.org/menu/latest/additional-category-registry.html
Categories=Utility;Graphics;GameTool;ImageProcessing;OCR;Qt
```

```
error: value "Utility;Graphics;GameTool;ImageProcessing;OCR;Qt" for key "Categories" in group "Desktop Entry" contains an unregistered value "GameTool"; values extending the format should start with "X-"
ERROR: Desktop file contains errors. Please fix them. Please see
https://standards.freedesktop.org/desktop-entry-spec/1.0/n for more information.
```
https://standards.freedesktop.org/desktop-entry-spec/1.0/n is also not a link that exists