remove redisDB dependency

This PR aims at removing the local redisdb dependency that makes it impossible to redistribute work across different servers.

Further work has been put in, here's a summary:

Use channel IDs while publishing instead of channel names
Rename API endpoints and associated functions
Fix indexes in information sent to slack (those +1s that you see in the loop)
Slightly changed the way the number of "published" claims is counted (making use of the new synced videos list)
Add 5% slack on UTXOs to avoid waiting a full block even if just a few transactions were made
Speed up startup by eliminating unnecessary block waits
Remove waiting for UTXOs by listing UTXOs (instead we just wait for a new block)
Small bug fixes

lbryio / lbry.go