subissue of #1775842: [meta] Convert all variables to state and/or config systems.
Slightly torn about whether the configuration should be called 'toolkit' or 'current_toolkit', went for just 'toolkit' in the end.
Oops forgot the yml file.
I wonder if it needs a seperate yml file or if it just needs to be added to the system settings one. I'm not sure.
I think this is happening as part of #1664844: Convert image toolkits into plugins
Yep seems this is a duplicated effort.
Re-rolled the other patch, closing this as a duplicate.
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