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Avoid writing empty string prefixed arrays into settings, and some
isNull vs isEmpty confusion (xml reader seems to read null instead of
empty strings in some cases).

Reordering isn't persistently saved yet.

Because otherwise implementing drag&drop is impossible.

Adding new categories is not there yet though, neither is moving tools
through the categories.

Not possible to reset them yet.
Saves the change in the settings instead of writing new tools xml files.
This probably needs to be adapted for tools that are "local" from the
beginning.

No editing possible yet.