Win32: Add a command-line option to let the escape button exit the emulator.
Merge pull request #5359 from thedax/newWin32CmdLineOption

Win32: Add a command-line (no GUI or ini) option to let the escape button exit the emulator.
Including <cstddef> here was reported to fix a build problem.
Merge remote-tracking branch 'upstream/master' into fps2