Make buildable with GCC in Linux

* 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

Utilities/SMutex.cpp

@@ -6,9 +6,9 @@ __forceinline void SM_Sleep()
 	Sleep(1);
 }
 
-__forceinline DWORD SM_GetCurrentThreadId()
+__forceinline std::thread::id SM_GetCurrentThreadId()
 {
-	return GetCurrentThreadId();
+	return std::this_thread::get_id();
 }
 
 __forceinline u32 SM_GetCurrentCPUThreadId()
@@ -23,4 +23,4 @@ __forceinline u32 SM_GetCurrentCPUThreadId()
 __forceinline be_t<u32> SM_GetCurrentCPUThreadIdBE()
 {
 	return SM_GetCurrentCPUThreadId();
-}
+}