PuTTY Plus 0.85 R5

What's new:

• Synchronized with security fixes from upstream (see https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html for more details)
• Implement putty embedded dll for use in a future version of SuperXPuTTY (#4 thanks to @xl32)
• Memory-issues fixes for the clickable URL support.
• Now all executables are included in the release archive (pscp, puttygen, psftp, pagenet, plink, pterm).