Adds SchemaChanger to perform database schema changes #1146
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This is mostly based on code I had already written for a personal project, which I've been meaning to integrate into SQLite for a while now. As such, it already had a bit of testing, but not much.
Open questions: should this be in SQLite.swift, or in another project? Which cases are not covered yet? What methods should be made public?
Fixes #1073