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/target_host_interface/TargetHostInterfaceInfo.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2016, Rene Gollent, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef TARGET_HOST_INTERFACE_INFO_H
+#define TARGET_HOST_INTERFACE_INFO_H
+
+#include <String.h>
+
+#include <Referenceable.h>
+#include <util/DoublyLinkedList.h>
+
+
+class Settings;
+class SettingsDescription;
+class TargetHostInterface;
+
+
+class TargetHostInterfaceInfo : public BReferenceable {
+public:
+								TargetHostInterfaceInfo(const BString& name);
+	virtual						~TargetHostInterfaceInfo();
+
+			const BString&		Name() const { return fName; }
+
+	virtual	status_t			Init() = 0;
+
+	virtual	bool				IsLocal() const = 0;
+	virtual	bool				IsConfigured(Settings* settings) const = 0;
+	virtual	SettingsDescription* GetSettingsDescription() const = 0;
+
+	virtual	status_t			CreateInterface(Settings* settings,
+									TargetHostInterface*& _interface) const
+									= 0;
+
+private:
+			BString				fName;
+};
+
+#endif	// TARGET_HOST_INTERFACE_INFO_H