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/xboxkrnl_nt.cc

@@ -0,0 +1,52 @@
+/**
+ ******************************************************************************
+ * 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/xboxkrnl_nt.h>
+
+#include <xenia/kernel/shim_utils.h>
+#include <xenia/kernel/xboxkrnl/kernel_state.h>
+#include <xenia/kernel/xboxkrnl/xboxkrnl_private.h>
+#include <xenia/kernel/xboxkrnl/xobject.h>
+
+
+using namespace xe;
+using namespace xe::kernel;
+using namespace xe::kernel::xboxkrnl;
+
+
+namespace xe {
+namespace kernel {
+namespace xboxkrnl {
+
+
+SHIM_CALL NtClose_shim(
+    xe_ppc_state_t* ppc_state, KernelState* state) {
+  uint32_t handle = SHIM_GET_ARG_32(0);
+
+  XELOGD(
+      "NtClose(%.8X)",
+      handle);
+
+  X_STATUS result = X_STATUS_INVALID_HANDLE;
+
+  result = state->object_table()->RemoveHandle(handle);
+
+  SHIM_SET_RETURN(result);
+}
+
+
+}  // namespace xboxkrnl
+}  // namespace kernel
+}  // namespace xe
+
+
+void xe::kernel::xboxkrnl::RegisterNtExports(
+    ExportResolver* export_resolver, KernelState* state) {
+  SHIM_SET_MAPPING("xboxkrnl.exe", NtClose, state);
+}