Use fwd header

nano/lib/fwd.hpp

@@ -17,6 +17,7 @@ class network_constants;
 class object_stream;
 class root;
 class thread_pool;
+class thread_runner;
 class tomlconfig;
 template <typename Key, typename Value>
 class uniquer;

nano/node/fwd.hpp

@@ -53,6 +53,7 @@ enum class vote_code;
 
 namespace nano::scheduler
 {
+class component;
 class hinted;
 class manual;
 class optimistic;

nano/node/node.hpp

@@ -31,37 +31,6 @@
 #include <optional>
 #include <vector>
 
-namespace nano
-{
-class active_elections;
-class bandwidth_limiter;
-class confirming_set;
-class message_processor;
-class monitor;
-class node;
-class telemetry;
-class online_reps;
-class vote_processor;
-class vote_cache_processor;
-class vote_router;
-class work_pool;
-class peer_history;
-class port_mapping;
-class thread_runner;
-
-namespace scheduler
-{
-	class component;
-}
-namespace transport
-{
-	class tcp_listener;
-}
-namespace rocksdb
-{
-} // Declare a namespace rocksdb inside nano so all references to the rocksdb library need to be globally scoped e.g. ::rocksdb::Slice
-}
-
 namespace nano
 {
 class node final : public std::enable_shared_from_this<node>