Improve fluid error messages
The error messages of fluid could be a bit more helpful
Instead of 'Argument "fo" was not registered' use 'Argument "fo" was not registered for "f:image"'
Instead of 'Required argument "src" was not supplied for "f:image"'
so it is far easier to search for the error.
I don't know how a filename could be handled as this would be even more helpful
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