[C++]: add username to default Aeron directory.
[C++]: add username to default Aeron directory.

galderz/Aeron,tbrooks8/Aeron,EvilMcJerkface/Aeron,gkamal/Aeron,EvilMcJerkface/Aeron,mikeb01/Aeron,mikeb01/Aeron,RussellWilby/Aeron,jerrinot/Aeron,tbrooks8/Aeron,galderz/Aeron,tbrooks8/Aeron,EvilMcJerkface/Aeron,oleksiyp/Aeron,RussellWilby/Aeron,buybackoff/Aeron,real-logic/Aeron,jerrinot/Aeron,galderz/Aeron,UIKit0/Aeron,EvilMcJerkface/Aeron,UIKit0/Aeron,lennartj/Aeron,oleksiyp/Aeron,RussellWilby/Aeron,buybackoff/Aeron,real-logic/Aeron,lennartj/Aeron,mikeb01/Aeron,gkamal/Aeron,mikeb01/Aeron,lennartj/Aeron,jerrinot/Aeron,UIKit0/Aeron,real-logic/Aeron,galderz/Aeron,oleksiyp/Aeron,buybackoff/Aeron,gkamal/Aeron,real-logic/Aeron