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/xam/xam_user.cc

@@ -0,0 +1,69 @@
+/**
+ ******************************************************************************
+ * 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/xam/xam_user.h>
+
+#include <xenia/kernel/shim_utils.h>
+#include <xenia/kernel/xam/xam_private.h>
+#include <xenia/kernel/xam/xam_state.h>
+
+
+using namespace xe;
+using namespace xe::kernel;
+using namespace xe::kernel::xam;
+
+
+namespace xe {
+namespace kernel {
+namespace xam {
+
+
+SHIM_CALL XamUserGetXUID_shim(
+    xe_ppc_state_t* ppc_state, XamState* state) {
+  uint32_t user_index = SHIM_GET_ARG_32(0);
+  uint32_t xuid_ptr = SHIM_GET_ARG_32(1);
+
+  XELOGD(
+      "XamUserGetXUID(%d, %.8X)",
+      user_index,
+      xuid_ptr);
+
+  if (xuid_ptr) {
+    SHIM_SET_MEM_32(xuid_ptr, 0xBABEBABE);
+  }
+
+  SHIM_SET_RETURN(0);
+}
+
+
+SHIM_CALL XamUserGetSigninState_shim(
+    xe_ppc_state_t* ppc_state, XamState* state) {
+  uint32_t user_index = SHIM_GET_ARG_32(0);
+
+  XELOGD(
+      "XamUserGetSigninState(%d)",
+      user_index);
+
+  SHIM_SET_RETURN(0);
+}
+
+
+// XamUserReadProfileSettings
+
+
+}  // namespace xam
+}  // namespace kernel
+}  // namespace xe
+
+
+void xe::kernel::xam::RegisterUserExports(
+    ExportResolver* export_resolver, XamState* state) {
+  SHIM_SET_MAPPING("xam.xex", XamUserGetXUID, state);
+  SHIM_SET_MAPPING("xam.xex", XamUserGetSigninState, state);
+}