Move rpc.proto into the resources directory along with all of the other
external resources.
Fix up the resource paths to reference external resources correctly
depending on wether the app is being run locally or from a release.
Only one of these files was being used, and they were going out of step
relative to one another.
Put rpc.proto in the resources directory for consistency with other
vendored resources, i.e. the lnd binary
Updated the def from:
https://github.com/lightningnetwork/lnd/blob/master/lnrpc/rpc.proto
Tom Kirkpatrick
Ben Woosley
Jack Mallers