Adding begin, end, size progation for containers

1.0.3

Adding begin,end,size propagation for containers which support it

Release 1.0.2

Adding compilation check for strict safety, when only holding pointers to classes with virtual dtor is possible.
To enable you have to add -DOWNED_POINTER_STRICT_SAFETY flag to compilation.

Release 1.0.1

Fix for C++14 compile error due to using type_traits present in C++17

Release 1.0

First release