[Bug 47901] New: Stream the files in Screenshot.pl and GetFile.pl

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=47901

Bug ID: 47901
           Summary: Stream the files in Screenshot.pl and GetFile.pl
           Product: Wine-Testbot
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Screenshot.pl and GetFile.pl load their files entirely in memory before
returning them. That's wasteful.

Also GetFiles.pl loads it in a $ImageBytes variable despite returning patches
and executables.