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_formatters/StringValueFormatter.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2015, Rene Gollent, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef STRING_VALUE_FORMATTER_H
+#define STRING_VALUE_FORMATTER_H
+
+
+#include "ValueFormatter.h"
+
+
+class Settings;
+class Value;
+
+
+class StringValueFormatter : public ValueFormatter {
+public:
+								StringValueFormatter();
+	virtual						~StringValueFormatter();
+
+	virtual	Settings*			GetSettings() const
+									{ return NULL; }
+
+	virtual	status_t			FormatValue(Value* value, BString& _output);
+};
+
+
+#endif	// STRING_VALUE_FORMATTER_H