The general idea here is to have the wasm build have a `NewXXXDatabase`
that doesn't import any postgres package and hence we never import
`lib/pq`, which doesn't work under WASM (undefined `userCurrent`).
* SQLite support for appservice
* SQLite support for mediaapi
* Copyright notices
* SQLite for public rooms API (although with some slight differences in behaviour)
* Lazy match aliases, add TODOs
* Fall back to postgres when parsing the database connection string for a URI schema fails
* Fix behaviour so that it really tries postgres when URL parsing fails and it complains about unknown schema if it succeeds
