GTK: memory dump window usability fix: copy values when cells are clicked.

git-svn-id: https://pcsxr.svn.codeplex.com/svn/pcsxr@86320 e17a0e51-4ae3-4d35-97c3-1a29b211df97
GTK: autoload cheats from default path and filename, e.g. /home/user/.pcsxr/cheats/SLUS_90064-SLUS90064.cht. Also if entered cheat code is incorrect don't close input dialog.

git-svn-id: https://pcsxr.svn.codeplex.com/svn/pcsxr@86327 e17a0e51-4ae3-4d35-97c3-1a29b211df97