iox-#220 require C++14 for iceoryx

[elBoberido]

Signed-off-by: Mathias Kraus [email protected]

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Notes for Reviewer

Switch to C++14. This makes lambdas more convenient to use with auto and enables if and switch statements and loops in constexpr-declared functions.
Additionally we can use the standard [[deprecated]] attribute instead of [[gnu::deprecated]]

https://en.wikipedia.org/wiki/C++14

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References

• Closes C++14 #220

[mossmaurice]

Use C++11, however we try to introduce C++14 as fast as possible

Could you update the CONTRIBUTING.md?

You could also remove enable_if_t from the iceoryx_utils/include/iceoryx_utils/cxx/type_trait.hpp