Add mouse events with coordinate to GLWidget

[ntadej]

Add mouse events with coordinate to GLWidget:

    void onMouseDoubleClickEvent(QMapLibre::Coordinate coordinate);
    void onMousePressEvent(QMapLibre::Coordinate coordinate);
    void onMouseReleaseEvent(QMapLibre::Coordinate coordinate);
    void onMouseMoveEvent(QMapLibre::Coordinate coordinate);

Fixes #82.

/cc @cgalvan @wecand0

[cgalvan]

Awesome, thanks for adding this! :)

[wecand0]

thank you!