Implement side chain federators:

Co-authored-by: seelabs <scott.determan@yahoo.com>
Co-authored-by: Peng Wang <pwang200@gmail.com>

Builds/CMake/RippledCore.cmake

@@ -407,6 +407,17 @@ target_sources (rippled PRIVATE
   src/ripple/app/rdb/impl/RelationalDBInterface_nodes.cpp
   src/ripple/app/rdb/impl/RelationalDBInterface_postgres.cpp
   src/ripple/app/rdb/impl/RelationalDBInterface_shards.cpp
+  src/ripple/app/sidechain/Federator.cpp
+  src/ripple/app/sidechain/FederatorEvents.cpp
+  src/ripple/app/sidechain/impl/ChainListener.cpp
+  src/ripple/app/sidechain/impl/DoorKeeper.cpp
+  src/ripple/app/sidechain/impl/InitialSync.cpp
+  src/ripple/app/sidechain/impl/MainchainListener.cpp
+  src/ripple/app/sidechain/impl/SidechainListener.cpp
+  src/ripple/app/sidechain/impl/SignatureCollector.cpp
+  src/ripple/app/sidechain/impl/SignerList.cpp
+  src/ripple/app/sidechain/impl/TicketHolder.cpp
+  src/ripple/app/sidechain/impl/WebsocketClient.cpp
   src/ripple/app/tx/impl/ApplyContext.cpp
   src/ripple/app/tx/impl/BookTip.cpp
   src/ripple/app/tx/impl/CancelCheck.cpp
@@ -576,6 +587,7 @@ target_sources (rippled PRIVATE
   src/ripple/rpc/handlers/DepositAuthorized.cpp
   src/ripple/rpc/handlers/DownloadShard.cpp
   src/ripple/rpc/handlers/Feature1.cpp
+  src/ripple/rpc/handlers/FederatorInfo.cpp
   src/ripple/rpc/handlers/Fee1.cpp
   src/ripple/rpc/handlers/FetchInfo.cpp
   src/ripple/rpc/handlers/GatewayBalances.cpp

Builds/levelization/results/loops.txt

@@ -11,7 +11,7 @@ Loop: ripple.app ripple.nodestore
   ripple.app > ripple.nodestore
 
 Loop: ripple.app ripple.overlay
-  ripple.overlay ~= ripple.app
+  ripple.overlay == ripple.app
 
 Loop: ripple.app ripple.peerfinder
   ripple.peerfinder ~= ripple.app

Builds/levelization/results/ordering.txt

@@ -6,6 +6,7 @@ ripple.app > ripple.crypto
 ripple.app > ripple.json
 ripple.app > ripple.protocol
 ripple.app > ripple.resource
+ripple.app > ripple.server
 ripple.app > test.unit_test
 ripple.basics > ripple.beast
 ripple.conditions > ripple.basics