Jasm Sison

vfs support - ready for full review to merge

1

Done! Please review and consider for merging.

Window/Aggregate function implementation -- please review

2

So, I took one of sqlite3's [sumint example](https://github.com/Buggaboo/sqlite-loadable-rs/tree/feature/add-create-window-function) to develop the _window function_, because I'm planning on using this codebase to develop other interesting window functions. I'm not so super...

Please, make the scalar function callback aux mutable, because the context stored in aux can change. In my specific [flatbuffer / flexbuffer project](https://github.com/Buggaboo/flat_sqlite_rs), I have a mutable builder that creates...