[C++ API] Making member functions const

Hello

What do you think about making some (all) Imageclass member functions 
that are /getters/ (don't modify the Image object) 
const(https://www.geeksforgeeks.org/const-member-functions-c/)? It'd be 
then possible to create methods that pass const Image &image as an 
argument in the API consumer - make sure that the Image object does not 
get modified.

I can see that some methods are already const:
     ImageType       type ( void ) const;
but not all of them that could be, eg:
     std::string     attribute ( const std::string name_ );

I could prepare such a patch.

--
Best regards
Przemysław Sobala

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