Loading the hero_options file is done across mods amending to existing file

This enables custom hero portraits easily added via a mod, which just
extends the hero_options file by a line and adding a portrait.
Merge pull request #750 from stefanbeller/customportrait

Loading the hero_options file is done across mods amendingly
Fix typo in Load Game menu
Merge pull request #761 from dorkster/typo

Fix typo in Load Game menu
Merge remote-tracking branch 'upstream/master'