Using of qualified eastl compare function names

[miherius]

Fixing of compilation error when some of eastl containers used with std types. Reason: ambiguity of equal() and lexicographical_compare() functions call in overloaded compare operators, which conflicts with its std counterparts. So, you can't compare eastl::vector<std::string> using operators==(), but compare of eastl::array<std::string> works fine, because latter use qualified names for its compare operators.

This PR just unifies using of compare functions across all eastl containers. So, all unqualified calls to equal() and lexicographical_compare() functions replaced with quailified ones.

I'm not sure that's a good idea to write tests which can't be compiled in the pre-PR version, so I skipped this part.

Tested on VS 2017 and GCC 7.4

[rparolin]

Thanks for the PR!