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[concept] Cleanup isCallable()

Carsten Gräser requested to merge feature/cleanup-iscallable into master

Now isCallable(f,args...) checks if f(args...) is valid. Before, the arguments had to be given as a Dune::TypeList which is misleading and can even be considered a bug. Since this was not used anywhere, this commit changes the behaviour to the expected one.

This also fixes the return value type of isCallable() by properly forwarding bool_constant values.

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