Depsgraph: Comb code to a better state all over

Some summary of changes:

- Don't use DEG prefix for types and enumerator values:
  the code is already inside DEG namespace.

- Put code where it locally belongs to: avoid having one
  single header file with all sort of definitions in it.

- Take advantage of modern C++11 enabled by default.

source/blender/depsgraph/intern/debug/deg_debug.h

@@ -0,0 +1,66 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2013 Blender Foundation.
+ * All rights reserved.
+ *
+ * Original Author: Sergey Sharybin
+ * Contributor(s): None Yet
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/depsgraph/intern/debug/deg_debug.h
+ *  \ingroup depsgraph
+ */
+
+#pragma once
+
+#include "intern/depsgraph_type.h"
+
+#include "BKE_global.h"
+
+#include "DEG_depsgraph_debug.h"
+
+namespace DEG {
+
+#define DEG_DEBUG_PRINTF(depsgraph, type, ...) \
+	do { \
+		if (DEG_debug_flags_get(depsgraph) & G_DEBUG_DEPSGRAPH_ ## type) { \
+			DEG_debug_print_begin(depsgraph); \
+			fprintf(stdout, __VA_ARGS__); \
+		} \
+	} while (0)
+
+#define DEG_GLOBAL_DEBUG_PRINTF(type, ...) \
+	do { \
+		if (G.debug & G_DEBUG_DEPSGRAPH_ ## type) { \
+			fprintf(stdout, __VA_ARGS__); \
+		} \
+	} while (0)
+
+#define DEG_ERROR_PRINTF(...)               \
+	do {                                    \
+		fprintf(stderr, __VA_ARGS__);       \
+		fflush(stderr);                     \
+	} while (0)
+
+bool terminal_do_color(void);
+string color_for_pointer(const void *pointer);
+string color_end(void);
+
+}  // namespace DEG