Break out the disassembler code from the WXWidgets UI.

This cleans up some of the code between core and UI for disassembling and dumping code blocks.
Should help the QT UI in bringing up its debug UI since it won't have to deal with this garbage now.

Source/Core/UICommon/Disassembler.h

@@ -0,0 +1,17 @@
+// Copyright 2008 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "Common/CommonTypes.h"
+
+class HostDisassembler
+{
+public:
+	virtual ~HostDisassembler() {}
+	virtual std::string DisassembleHostBlock(const u8* code_start, const u32 code_size, u32* host_instructions_count) { return "(No disassembler)"; }
+};
+
+HostDisassembler* GetNewDisassembler(const std::string& arch);
+std::string DisassembleBlock(HostDisassembler* disasm, u32* address, u32* host_instructions_count, u32* code_size);