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/cpu/global_exports.h

@@ -13,9 +13,9 @@
 #include <xenia/common.h>
 #include <xenia/core.h>
 
+#include <xenia/export_resolver.h>
 #include <xenia/cpu/ppc/state.h>
 #include <xenia/cpu/sdb/symbol.h>
-#include <xenia/kernel/export.h>
 
 
 namespace xe {
@@ -33,7 +33,7 @@ typedef struct {
       xe_ppc_state_t* state, uint64_t cia, uint64_t ea);
   void (_cdecl *XeTraceKernelCall)(
       xe_ppc_state_t* state, uint64_t cia, uint64_t call_ia,
-      kernel::KernelExport* kernel_export);
+      KernelExport* kernel_export);
   void (_cdecl *XeTraceUserCall)(
       xe_ppc_state_t* state, uint64_t cia, uint64_t call_ia,
       sdb::FunctionSymbol* fn);