- NadekoBot class renamed to Bot

- Implemented grpc based coordinator. Supports restarting, killing single or all shards, as well as getting current shard statuses. (Adaptation of the one used by the public bot)
- Coord is setup via coord.yml file
- Methods from SelfService which deal with shard/bot restart etc have been moved to ICoordinator (with GrpcRemoteCoordinator being the default implementation atm)
- Vastly simplified NadekoBot/Program.cs

src/NadekoBot.Coordinator/coord.yml

@@ -0,0 +1,5 @@
+TotalShards: 1
+RecheckIntervalMs: 5000
+ShardStartCommand: dotnet
+ShardStartArgs: run -p "<absolute path to NadekoBot.csproj>" --no-build -- {0}
+UnresponsiveSec: 30