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/app.hpp

@@ -33,7 +33,9 @@ enum class LaunchType {
     Forwader_Sphaira,
 };
 
+// todo: why is this global???
 void DrawElement(float x, float y, float w, float h, ThemeEntryID id);
+void DrawElement(const Vec4&, ThemeEntryID id);
 
 class App {
 public:
@@ -56,8 +58,8 @@ public:
     static void NotifyFlashLed();
 
     static auto GetThemeMetaList() -> std::span<ThemeMeta>;
-    static void SetTheme(u64 theme_index);
-    static auto GetThemeIndex() -> u64;
+    static void SetTheme(s64 theme_index);
+    static auto GetThemeIndex() -> s64;
 
     static auto GetDefaultImage(int* w = nullptr, int* h = nullptr) -> int;
 
@@ -143,7 +145,7 @@ public:
 
     Theme m_theme{};
     fs::FsPath theme_path{};
-    std::size_t m_theme_index{};
+    s64 m_theme_index{};
 
     bool m_quit{};