Bump copyright year in tool output and user visible strings to 2016.

Task-number: QTBUG-50578
Change-Id: I2f4aa9089c6672726f554cba7e6009b425d27683
Reviewed-by: Liang Qi <liang.qi@theqtcompany.com>
Reviewed-by: Topi Reiniö <topi.reinio@theqtcompany.com>
Reviewed-by: Martin Smith <martin.smith@theqtcompany.com>