[All] Fixed multiple issues during build on Linux

- Added some fixes introduced by RodoMa92 in PR198

- Lack of AVX2 extension (should be done differently in the future)
- Disable deprecated-volatile warning
- Added missing override in posix EventInfo, ImGui notification class and XContent class
- Removed not used XAudio2.h include in XMP
- Fixed missing switch-case in XObject
- Added fugly template in native_list.h
- Fixed multiple smaller issues

src/xenia/cpu/ppc/ppc_translator.cc

@@ -151,7 +151,11 @@ void PPCTranslator::DumpHIR(GuestFunction* function, PPCHIRBuilder* builder) {
 
     {
       wchar_t tmpbuf[64];
+#ifdef XE_PLATFORM_WIN32
       _snwprintf(tmpbuf, 64, L"%X", function->address());
+#else
+      swprintf(tmpbuf, 64, L"%X", function->address());
+#endif
       folder_path.append(&tmpbuf[0]);
     }