Adds Base class to tests

Base class displays the Menu( <- O -> )
Improved in some tests the way to create entries.
Instead of defining the tests twice: the "create" method, and the entry
   in the array, it is only needed in the array (ActionsTest, SpriteTest
   and Texture2DTest)

__IMPORTANT__:
  - Android, Linux, Emsciprten and Win32 projects were not fixed.
  The files `BaseTest.cpp` and `BaseTest.h` needs to be added in their make files.