128-bit integral feature define fix (electronicarts#393)

Oss/next release (electronicarts#391)

Ensure the alignment of a node<value_type> is the alignment of the whole node allocation, not just the user type

Removing old compiler special case code for EA_CPP14_CONSTEXPR

Adding eastl::string hash tests and removing an addition overload in the helper template that contrains usage to enum types.

Fixing user reported regression when attempting to use fancy pointers in a tuple

Resolving uint128_t hashing compiler errors from properly limiting the generic template for enums

eastl::pair adding C++17 structured bindings unpacking support

eastl::atomic<T> implementation - See EASTL/atomic.h for documentation

eastl::function - Optimized function call operator

Consolidate Warnings by using EA_DISABLE_WARNING macros

Reverting the UDL warning suppression because of push/pop mismatch issues with the EABase warning suppression macros

eastl::variant - Fixed variant warnings due to not sfinae overloads that are not the same type but still comparable
               - improved code gen on msvc
               -added tests

Removed unndeded allocator_traits headers

Added comments on reverse_wrapper

Removed sparse_matrix.h as it was removed internally quite a while ago

Updated files that had slight differences to internal eastl

Update travis CI to use g++-9 && clang++-11

Updated README and CONTRIBUTING to allow contributors to submit their info under the contributors section

EASTL 3.16.07

updating submodules

3.14.02 release