New features:

• Add Dutch translation
• Add new image for finish tile in editor
• Roughly sort tracks by length/complexity/difficulty
• Show how to unlock track

Bug fixes:

• Fix GitHub Issue #95: Time Trials don't work, dustrac just exits
• Fix early finish on 3 tracks
• Include for std::runtime_error

Other:

• build fix for darwin and avoiding suprious deprecated warnings.
• Award a half star for rank 11
• Update new lap record in a thread to avoid stutter
• Fix GitHub Issue #57: Replace QSettings with SQLite
  • Store lap records to an SQLite database
  • Store race records to an SQLite database
  • Store best positions to an SQLite database
  • Store track unlock to an SQList database