switch to go-based SQLite driver (colin)

[erikdw]

Note
This is a resurrection of Colin King's attempt to do this:

• https://github.com/segmentio/ctlstore/tree/colin-zoomify-sqlite

See Collin Van Dyck's version here: #129

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• switch from CGO-based driver to Go-based
• "fix" sqlite watch failures by removing connect hook

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Warning
For this PR to be viable, we'll need to either:

• fix that by adding connect hooks with the Go-based sqlite driver somehow -OR-
• change the build & module import setup to somehow support using the Go-based driver for the library we produce, but the CGO-based library for the ctlstore-reflector and other ctlstore daemons.