Linux: added initial multi-touch support #965
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This pull request add multi-touch support with Linux using XInput2 (X11 extension), and is based on
Mario PR: feature/windows_touch.
I'm using this extension because that's the way it is usually done with other libraries (such as GTK or SDL).
Just like Mario PR, I did not implement non-event touch functions like
sf::Touch::isDown(i)
for obvious reasons (see Mario comments). I'll wait for these features to be implemented into Mario PR.