Add support for shared_ptr and containers of pointers

[awulkiew]

Currently it's not possible to visualize the following:

struct MyPoint
{
    int x;
    int y;
};
typedef std::shared_ptr<MyPoint> MyPointPtr;
std::vector<MyPointPtr> ptrs;

[yurrig]

Also it would be nice to visualize pointers to containers, e.g.

struct MyPoint
{
    int x;
    int y;
};
std::vector<MyPoint> * pts;

[awulkiew]

@yurrig You can write (*pts) to visualize this container.