Update: Bug fixes, Waterfox support

The most recent version of Little Dig Game (7258ad) comes with a few bug fixes:

• Fix pixel darkness not updating when a tombstone is placed
• Fix saving + loading of player stats (e.g. play time)
• (Hopefully) fix instances where the dialogs for both endings get shown

Additionally, this update includes a change to replace the use of the latest Map iterator functions with good ol' loops to support Waterfox.