Some events don't propagate correctly to the right sub-window
and some things like the pad handler don't even necessarily have
windows. So, just register some events with the top-level app.
Also add a virtual destructor to the PadHandlerBase to be able to
deal with multiple inheritance in the derived classes.
- Use Bind instead of connect. It's recommended for anyone using wx 2.9+
- Remove AppConnector. All this did was destroy objects used in the UI. However, wxWidgets handles this. So it's redundant.
- Misc other unimportant changes.
* replace GetThreadID with std::this_thread.getId()
* name all anonymous structs and unions that contain non-trivially constructable objects
* made default constructor for big endian type noexcept to make it work with std::atomic
* move instantiated specialized template function members ouside of the class definition to comply with the standard
* added default instantiation for template parameter "=nullptr"
* used the C++11 standardized thread_local instead of the __declspec(thread)
* added transitional definitions to bridge the microsoft specific calls (compare and exchange and aligned alloc)
* removed cyclic dependency between Emulator->CPUThreadManager->CPUThread->SMutex->Emulator->...
* fixed some instances of indentation by space instead of tabs
* surrounded some unused code with an #if 0 block to make sure it doesn't compile
* Removed Compiler ELF references from rpcs3.cpp
* Reordered the menu bar lines.
* Moved the construction of some panels of MainFrame from rpcs3.cpp to
MainFrame.cpp
