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/file_viewer.hpp

@@ -23,8 +23,8 @@ private:
 
     std::unique_ptr<ScrollableText> m_scroll_text;
 
-    std::size_t m_start{};
-    std::size_t m_index{}; // where i am in the array
+    s64 m_start{};
+    s64 m_index{}; // where i am in the array
 };
 
 } // namespace sphaira::ui::menu::fileview