Massive refactoring of all code + audio skeleton.

This should make it easier to find files and (in the future) split things
up into separate libraries.
It also changes around emulator initialization to make it a little more
difficult to do things out of order and a little more sensible as to when
real init work happens.
Also adding a skeleton audio system/driver and reworking CPU register
access to be more extensible.

src/xenia/kernel/xboxkrnl/async_request.cc

@@ -0,0 +1,42 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <xenia/kernel/xboxkrnl/async_request.h>
+
+#include <xenia/kernel/xboxkrnl/xobject.h>
+#include <xenia/kernel/xboxkrnl/objects/xevent.h>
+
+
+using namespace std;
+using namespace xe;
+using namespace xe::kernel;
+using namespace xe::kernel::xboxkrnl;
+
+
+XAsyncRequest::XAsyncRequest(
+    KernelState* kernel_state, XObject* object,
+    CompletionCallback callback, void* callback_context) :
+    kernel_state_(kernel_state), object_(object),
+    callback_(callback), callback_context_(callback_context),
+    apc_routine_(0), apc_context_(0) {
+  object_->Retain();
+}
+
+XAsyncRequest::~XAsyncRequest() {
+  for (vector<XEvent*>::iterator it = wait_events_.begin();
+       it != wait_events_.end(); ++it) {
+    (*it)->Release();
+  }
+  object_->Release();
+}
+
+void XAsyncRequest::AddWaitEvent(XEvent* ev) {
+  ev->Retain();
+  wait_events_.push_back(ev);
+}