Move plugins to external folder

applications/external/game15/sandbox.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <input/input.h>
+
+typedef enum {
+    EventTypeTick,
+    EventTypeKey,
+} EventType;
+
+typedef struct {
+    EventType type;
+    InputEvent input;
+} GameEvent;
+
+typedef void (*SandboxRenderCallback)(Canvas* canvas);
+typedef void (*SandboxEventHandler)(GameEvent event);
+
+void sandbox_init(
+    uint8_t fps,
+    SandboxRenderCallback render_callback,
+    SandboxEventHandler event_handler);
+void sandbox_loop();
+void sandbox_loop_exit();
+void sandbox_free();