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/model/LineDataSource.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2014, Rene Gollent, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef LINE_DATA_SOURCE_H
+#define LINE_DATA_SOURCE_H
+
+
+#include <Referenceable.h>
+
+
+class LineDataSource : public BReferenceable {
+public:
+	virtual						~LineDataSource();
+
+	virtual	int32				CountLines() const = 0;
+	virtual	const char*			LineAt(int32 index) const = 0;
+	virtual int32				LineLengthAt(int32 index) const = 0;
+};
+
+
+#endif	// LINE_DATA_SOURCE_H