online: Add compat/RTypes.h header for compatability with root macros.

Fixes warnings in TRD classes.

algo/base/compat/RTypes.h

+/* Copyright (C) 2024 FIAS Frankfurt Institute for Advanced Studies, Frankfurt / Main
+   SPDX-License-Identifier: GPL-3.0-only
+   Authors: Felix Weiglhofer [committer] */
+#pragma once
+
+/**
+ * @file RTypes.h
+ * @brief Compatibility header for basic ROOT macros.
+**/
+
+#if __has_include(<Rtypes.h>)
+#include <Rtypes.h>
+#else
+#define BIT(n) (1ULL << (n))
+#define SETBIT(n, i) ((n) |= BIT(i))
+#define CLRBIT(n, i) ((n) &= ~BIT(i))
+#define TESTBIT(n, i) ((bool) (((n) &BIT(i)) != 0))
+#endif