sqlite3 1.7.0

• Add support for application-defined window functions. To register a custom window function, implement WindowFunction and register your function with database.registerAggregateFunction.
• Breaking (For the experimental package:sqlite3/wasm.dart library):
  • The IndexedDB implementation now stores data in 4k blocks instead of full files.
  • Removed IndexedDbFileSystem.load. Use IndexedDbFileSystem.open instead.
  • An IndexedDbFileSystem now stores all files, the concept of a persistence root has been removed. To access independent databases, use two IndexedDbFileSystems with a different database name.