Small fix for OptionSet creation

[alexej-jordan]

The implicit conversion failed for a Polymake.Vector{Float64}, which can be used during visualization. This PR only introduces a small change to fix this: we now convert the value to a PolymakeType before calling option_set_take.

@benlorenz

[benlorenz]

I think that is reasonable, especially since we do the same when passing normal arguments to polymake functions.

For Polymake.Vector{Float64} this should not be necessary, it does make sense for a julia vector though. Can you add a small test?

Something like this should work with this change and fail without:

@test Polymake.OptionSet(Dict(:asdf=>[1,2,3])) isa Polymake.OptionSet

Edit: The CI failures seem unrelated and are an issue with the caching that should get better once #481 is merged.