invalid kwargs specification should throw an error now

[behinger]

this should introduce an error when running something like
plot_abc(...;visual = (bla=blub))
that is, not providing a NamedTuple because you forgot the ;

[behinger]

mhh CI fails. maybe there are some special cases we have to manually loop the kwarg through

[vladdez]

I would propose the following message:

Keyword argument specification (kwargs...) Specified config groups must be NamedTuples', but $(keys(kwargs)[.!is_namedtuple]) was not.
Maybe you forgot the semicolon (;) at the beginning of your specification? Compare these strings:

plot_example(...; layout = (; showColorbar=true))

plot_example(...; layout = (showColorbar=true))
 
 The first is correct and creates a NamedTuple as required. The second is wrong and is ignored.`

[vladdez]

I will merge because the problem is test_all and it is solved in main version (I hope)