[SDKBOXPlay] Submit 64bit scores to leaderboards

Currently SDKBOXPlay only supports submitting 32bit scores to leaderboards (V2.3.8.5)

static void submitScore( const std::string& leaderboard_name, int score );

Man your game have some large scores, we’ll look into this and see if we can support 64bit score

When I read this, I thought what type of game would have such large scores and then I thought about a pinball game.

unsigned int: 0 to 65535 so a pinball game score could be way higher than that.