Fix deadlock in DS4 output report thread, debug logging not allocating memory for string; other misc. things

[TheNathannator]

DS4 output thread:

• Use WaitForMultipleObjects to check the status of both the thread abort and overlapped events, prevents deadlocking when disposing client
• Use FALSE instead of 0 when checking GetOverlappedResult return
• Check for ERROR_OPERATION_ABORTED from GetOverlappedResult to indicate IO cancellation
• Don't cache output report when receiving an error from GetOverlappedResult
• Check for nullptr when allocating packet output string

_DBGPRINT:

• Properly allocate memory
  • Switched from the intended _malloca to standard malloc because the structured exception handling for it is not great lol
• Switch magic + 2 to + sizeof(WCHAR)
• Ensure string is null-terminated
• Output a line break

Other:

• Add .vscode/ folder to .gitignore
• Address warning in to_hex about signed/unsigned mismatch in comparison