Remove deprecated type-traits that were renamed

Simon Praetoriusrequested to merge
feature/remove-deprecated-typetraits into master

Summary

This MR removes the type-traits has_nan, is_indexable and is_range since those a deprecated and replaced by CamelCase names instead, see !466 (merged)

This issue was also discussed in #83 (closed)

Edited by Simon Praetorius

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