Implemented AlertDialog app (#117)

Tactility/Source/app/selectiondialog/SelectionDialog.cpp

@@ -109,15 +109,3 @@ extern const AppManifest manifest = {
 };
 
 }
-extern "C" {
-
-extern void tt_app_selectiondialog_start2(const char* title, int argc, const char* argv[]) {
-    std::vector<std::string> list;
-    for (int i = 0; i < argc; i++) {
-        const char* item = argv[i];
-        list.push_back(item);
-    }
-    tt::app::selectiondialog::start(title, list);
-}
-
-}

Tactility/Source/app/selectiondialog/SelectionDialog.h

@@ -16,7 +16,10 @@ namespace tt::app::selectiondialog {
 
     void start(std::string title, const std::vector<std::string>& items);
 
-    /** App result data */
-
+    /**
+     * Get the index of the item that the user selected.
+     *
+     * @return a value greater than 0 when a selection was done, or -1 when the app was closed without selecting an item.
+     */
     int32_t getResultIndex(const Bundle& bundle);
 }