Compiler warnings gcc-5.2 on Ubuntu 15.10

@ilektron wrote:

I recently downloaded 3.9 and compiled the test only to be met with more warnings than I can count. I'd love to spend some spare time contributing, and would love to work towards a clean compile. However, this means changing some virtual function declarations, for example

virtual void onTouchCancelled(Touch *touch, Event *event) override {};

would have to be

virtual void onTouchCancelled(Touch* /* touch */, Event* /* event */) override {};

to get rid of unused parameters warnings.

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