util/shared_ptr.hpp: STX pointers library fixes

[elad335]

Bugs fixed:

• stx::shared_ptr::reset() was resetting pointer storage only if reference count became 0. (should always reset pointer storage)
• Fixup serialization in sys_process.
• Move destructor code in sys_config to IDM designated abort notification, operator=(thread_state), where it should be.
  Do a similar thing with lv2_socket and spu_thread.

Optimization:

• atomic_ptr constructors were adding a redundant atomic_t::store instead of raw access.

flixes #16447

[elad335]

@Darkhost1999 Fixed.

[Darkhost1999]

Fixed.

Indeed, and on all the games I previously tested in my library to have the issue has been resolved.

[Darkhost1999]

RPCS3.zip
Need for Speed™ The Run [BLUS30757] on game window close event after fatal error message. If there's not a fatal error the win32 exception won't occur.
cleaner log
RPCS3.log

[Darkhost1999]

RPCS3.log

·F 0:14:10.965577 {Emu State Load Thread: 'class ppu_function_manager'} SIG: Thread terminated due to fatal error: serial_breathe_and_tag(1): { reading, 0x1797f2be/0x179b0316, memory=0x8cb9d9, sample64=0x7b7fe6240f000000 }, object: 'none', next-object: 'class ppu_function_manager', expected/tag: 0x795e != 0x228,
(in file C:\Users\bryso\Documents\GitHub\rpcs3\rpcs3\Emu\savestate_utils.cpp:395[:24], in function unsigned short __cdecl stx::serial_breathe_and_tag(struct utils::serial &,class std::basic_string_view<char,struct std::char_traits<char> >,bool))

Saving states GTAV

[Darkhost1999]

RPCS3.log
Savestate fatal error still occurs in any game
rpcs3\rpcs3\Emu\savestate_utils.cpp:396[:24], in function 'ushort stx::serial_breathe_and_tag'
No win32 exception message

RPCS3.log
Need for Speed The Run and possibly more games if we can trigger a fatal error,
have a win32 exception error after the fatal error dialog message.

I don't think these are blocking issues. The PR resolves games booting and playing. issues remaining are niche scenarios