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shared_ptr is a candidates for the next STL version and Windows has
already adopted it.  This change removes ambiguity between the Boost
and Windows versions of the class.

Just for consistency with LogicOperator

also removed the shortcut 'el' because with the namespace it wouldn't be
that short anymore (and while we could use 'using namespace' in .cc,
'el' is then too short and might cause a conflict with other global names).

- use inline for the shared function
also removed some bad practices:
- remove unnamed namespace
- remove using [namespace] directives

In addition, make sure $(B10_CXXFLAGS) is used as part of CXXFLAGS.
Without this, warning flags could be unacceptably weakened.

Problem with Clang++, templates and RTTI, it creates two different RTTIs
for one class and it breaks tests.

It takes some test utilities from inside the loader tests and places
them to a header, to be shared by this test as well.

This includes small fix of loader interface, some of its methods can
(and should) be const.