IOS: Reorganise the source files and IPC_HLE→IOS

IPC_HLE is actually IOS HLE. The actual IPC emulation is not in
IPC_HLE, but in HW/WII_IPC.cpp. So calling IPC_HLE IOS is more
accurate. (If IOS LLE gets ever implemented, it'll likely be at
a lower level -- Starlet LLE.)

This also totally gets rid of the IPC_HLE prefix in file names, and
moves some source files to their own subdirectories to make the file
hierarchy cleaner.

We're going to get ~14 additional source files with the USB PR,
and this is really needed to keep things from becoming a total pain.

Source/Core/Core/IOS/DeviceStub.cpp

@@ -0,0 +1,42 @@
+// Copyright 2016 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "Core/IOS/DeviceStub.h"
+#include "Common/Logging/Log.h"
+
+namespace IOS
+{
+namespace HLE
+{
+CWII_IPC_HLE_Device_stub::CWII_IPC_HLE_Device_stub(u32 device_id, const std::string& device_name)
+    : IWII_IPC_HLE_Device(device_id, device_name)
+{
+}
+
+IOSReturnCode CWII_IPC_HLE_Device_stub::Open(const IOSOpenRequest& request)
+{
+  WARN_LOG(WII_IPC_HLE, "%s faking Open()", m_name.c_str());
+  m_is_active = true;
+  return IPC_SUCCESS;
+}
+
+void CWII_IPC_HLE_Device_stub::Close()
+{
+  WARN_LOG(WII_IPC_HLE, "%s faking Close()", m_name.c_str());
+  m_is_active = false;
+}
+
+IPCCommandResult CWII_IPC_HLE_Device_stub::IOCtl(const IOSIOCtlRequest& request)
+{
+  WARN_LOG(WII_IPC_HLE, "%s faking IOCtl()", m_name.c_str());
+  return GetDefaultReply(IPC_SUCCESS);
+}
+
+IPCCommandResult CWII_IPC_HLE_Device_stub::IOCtlV(const IOSIOCtlVRequest& request)
+{
+  WARN_LOG(WII_IPC_HLE, "%s faking IOCtlV()", m_name.c_str());
+  return GetDefaultReply(IPC_SUCCESS);
+}
+}  // namespace HLE
+}  // namespace IOS