Ad­just­ing map area

• Set the map area for an ex­ist­ing pro­ject
• Switch base layer types for map area se­lec­tion
• Show map area as an ed­itable map layer
• Mi­nor bug fixes and us­abil­ity im­prove­ments

Bug fixes and in­ter­nal im­prove­ments

• Fix a ma­jor bug (#15) that caused the app to crash when open­ing a pro­ject
• Re­moved po­ten­tial sources of in­sta­bil­ity in app startup rou­tines
• Re­duced du­pli­ca­tion and global state, po­ten­tially im­prov­ing mem­ory man­age­ment and per­for­mance
• Refac­tored app startup code for more ef­fi­cient and in­tu­itive de­vel­op­ment
• Up­dated to Ap­ple’s StoreKit 2 for sub­scrip­tion man­age­ment
• Re­moved warn­ings and er­rors from the ap­p’s build process