Make RCT2 know if LodePNG failed
Save screenshots when PrintScreen is pressed
Merge pull request #256 from adrian17/screenshots

Save screenshots when PrintScreen is pressed
Fixes combo boxes not pointing at selected item
Merge pull request #258 from duncanspumpkin/fix_options_combo

Fixes combo boxes not pointing at selected item
Merge branch 'master' of github.com:IntelOrca/OpenRCT2