[C++] Use initialization list in Image copy constructor.
[C++] Use initialization list in Image copy constructor.

real-logic/Aeron,mikeb01/Aeron,galderz/Aeron,EvilMcJerkface/Aeron,EvilMcJerkface/Aeron,EvilMcJerkface/Aeron,mikeb01/Aeron,real-logic/Aeron,real-logic/Aeron,galderz/Aeron,galderz/Aeron,mikeb01/Aeron,mikeb01/Aeron,EvilMcJerkface/Aeron,galderz/Aeron,real-logic/Aeron