Debugger: Split into core library and application.

- Add subfolder src/kits/debugger which contains the debugger's core
  functionality and lower layers. Correspondingly add headers/private/debugger
  for shared headers to be used by clients such as the Debugger application
  and eventual remote_debug_server. Adjust various files to account for
  differences as a result of the split and moves.
- Add libdebugger.so to minimal Jamfile.

headers/private/debugger/value/value_nodes/ExpressionValueNode.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2014, Rene Gollent, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef EXPRESSION_VALUE_NODE_H
+#define EXPRESSION_VALUE_NODE_H
+
+
+#include "ValueNode.h"
+
+
+class ExpressionValueNodeChild;
+
+
+class ExpressionValueNode : public ChildlessValueNode {
+public:
+								ExpressionValueNode(
+									ExpressionValueNodeChild* nodeChild,
+									Type* type);
+	virtual						~ExpressionValueNode();
+
+	virtual	Type*				GetType() const;
+
+	virtual	status_t			ResolvedLocationAndValue(
+									ValueLoader* valueLoader,
+									ValueLocation*& _location,
+									Value*& _value);
+
+private:
+			Type*				fType;
+};
+
+
+class ExpressionValueNodeChild : public ValueNodeChild {
+public:
+								ExpressionValueNodeChild(
+									const BString& expression,
+									Type* type);
+	virtual						~ExpressionValueNodeChild();
+
+	virtual	const BString&		Name() const;
+	virtual	Type*				GetType() const;
+	virtual	ValueNode*			Parent() const;
+
+	const BString&				GetExpression() const { return fExpression; };
+
+	virtual	status_t			ResolveLocation(ValueLoader* valueLoader,
+									ValueLocation*& _location);
+
+private:
+			BString				fExpression;
+			Type*				fResultType;
+};
+
+
+#endif	// EXPRESSION_VALUE_NODE_H