cl/gcc-adapt-ext: Default initialization test for C++ added.

NOTE: Issue #4 @ https://github.com/deekej/predator/ discovered here.
cl/gcc-adapt-ext: Zero and value initialization tests added.
cl/gcc-adapt-ext: Rest of the tests for initializations added.

TODO: These tests are only dummy tests for now. They need update when
      the support fot C++ STD library is added and they need a
      conditional compilation to be C++98 compliant.
Merge branch 'extension/initializations' into cl/gcc-adapt-ext