refactoring; modal window init

src/ui/widget/button.h

@@ -0,0 +1,15 @@
+#ifndef BUTTON_H
+#define BUTTON_H
+
+#include "../../main.h"
+#include "../widget.h"
+#include <stdint.h>
+
+typedef struct {
+  widget_t widget;
+  char value;
+  uint32_t is_focused : 1;
+  uint32_t is_disabled : 1;
+} button_t;
+
+#endif