Specifically this enables us to leverage `dotnet-resgen` to
auto-generate the `resx` files into `resources` files for the default
culture, which are then compiled into the SMA assembly.

This requires a change to the C# bindings. The Windows build system
takes `file.resx` and compiles `file.resources`, but CLI prepends the
assembly name, thus compiling `SMA.file.resources`. So the resource
manager in the generated bindings must be adjusted to look for
`SMA.file` instead of `file`.

Note that C# bindings cannot yet be auto-generated.

Given localized resources of the form `file.en-US.resx`, `dotnet-resgen`
will create a satellite assembly and publish it to
`en-US/SMA.resources.dll`, so #666 will not be a technical problem.