add touch support (#77)

* initial work on touch support

* add touch support to all objects

* add touch scrolling, fix scrollbar, fix appstore search

- when fireing an action, the action array may change. so the loop should break early as soon as an action is handled.
  this fixes the appstore search when pressing B.
- scrollbar no longer goes oob. fixes #76

currently, scrolling has no acceleration.

sphaira/include/ui/menus/irs_menu.hpp

@@ -61,7 +61,7 @@ private:
     Rotation m_rotation{Rotation_90};
     Colour m_colour{Colour_Grey};
     int m_image{};
-    std::size_t m_index{};
+    s64 m_index{};
 };
 
 } // namespace sphaira::ui::menu::irs