SCEE 58.21

This is the last version with the current background map library (tangram-es). Next version will use MapLibre, and might not work on certain old phones.

Changes since 58.2:

• New icon, by @westnordost
• Add title fragment in settings, by @ravenfeld
• Extend crossing markings quest (adjust it in quest settings), by @ravenfeld and @StenSoft
• Add chipseal to surfaces, by @ravenfeld
• Add SAC scale quest, by @ravenfeld
• Improve compatibility when importing GPX tracks for display, by @ravenfeld
• Crash fixes (thanks to various users for the reports)
• Update translations
• Other minor fixes/improvements