Now uses some of the old EIP712 code as common code between the two implementations + approve/reject button now works

src_features/signMessageEIP712_common/common_712.h

@@ -0,0 +1,10 @@
+#ifndef COMMON_EIP712_H_
+#define COMMON_EIP712_H_
+
+#include <stdint.h>
+#include "ux.h"
+
+unsigned int ui_712_approve_cb(const bagl_element_t *e);
+unsigned int ui_712_reject_cb(const bagl_element_t *e);
+
+#endif // COMMON_EIP712_H_