Reduce numbers.hpp includes with out-of-line definitions

Move boost/multiprecision/cpp_int.hpp out of numbers.hpp,
replacing it with the lighter fwd.hpp. Move inline constructors,
number(), and conversion operators to numbers.cpp. Extract ratio
constants into a new ratios.hpp header. Add explicit cpp_int.hpp
includes where needed.

# Conflicts:
#	nano/core_test/fork_cache.cpp
#	nano/core_test/vote_generator.cpp
#	nano/node/nodeconfig.hpp
#	nano/secure/common.hpp

Author: pwojcikdev

nano/core_test/block_store.cpp

@@ -5,6 +5,7 @@
 #include <nano/lib/files.hpp>
 #include <nano/lib/lmdbconfig.hpp>
 #include <nano/lib/logging.hpp>
+#include <nano/lib/ratios.hpp>
 #include <nano/lib/stats.hpp>
 #include <nano/lib/utility.hpp>
 #include <nano/lib/work.hpp>

nano/core_test/bucketing.cpp

@@ -1,3 +1,4 @@
+#include <nano/lib/ratios.hpp>
 #include <nano/node/bucketing.hpp>
 
 #include <gtest/gtest.h>

nano/core_test/fork_cache.cpp

@@ -1,4 +1,5 @@
 #include <nano/lib/blocks.hpp>
+#include <nano/lib/ratios.hpp>
 #include <nano/node/fork_cache.hpp>
 #include <nano/test_common/random.hpp>
 #include <nano/test_common/system.hpp>

nano/core_test/network_filter.cpp

@@ -1,6 +1,7 @@
 #include <nano/lib/blockbuilders.hpp>
 #include <nano/lib/blocks.hpp>
 #include <nano/lib/network_filter.hpp>
+#include <nano/lib/ratios.hpp>
 #include <nano/lib/stream.hpp>
 #include <nano/messages/messages.hpp>
 #include <nano/node/endpoint.hpp>

nano/core_test/numbers.cpp

@@ -1,6 +1,7 @@
 #include <nano/lib/balance_formatting.hpp>
 #include <nano/lib/numbers.hpp>
 #include <nano/lib/numbers_templ.hpp>
+#include <nano/lib/ratios.hpp>
 #include <nano/secure/common.hpp>
 #include <nano/secure/network_params.hpp>
 

nano/core_test/scheduler_buckets.cpp

@@ -1,5 +1,6 @@
 #include <nano/lib/blockbuilders.hpp>
 #include <nano/lib/blocks.hpp>
+#include <nano/lib/ratios.hpp>
 #include <nano/secure/common.hpp>
 #include <nano/secure/network_params.hpp>
 

nano/core_test/vote_generator.cpp

@@ -1,4 +1,5 @@
 #include <nano/lib/blocks.hpp>
+#include <nano/lib/ratios.hpp>
 #include <nano/lib/vote.hpp>
 #include <nano/node/node_observers.hpp>
 #include <nano/node/vote_generator.hpp>

nano/lib/balance_formatting.hpp

@@ -24,7 +24,7 @@ void encode_balance_frac (std::ostream & stream, Value value, Value scale, int p
 template <typename Value>
 void encode_balance_int (std::ostream & stream, Value value, char group_sep, std::string const & groupings)
 {
-	auto largestPow10 = nano::uint256_t (1);
+	auto largestPow10 = Value{ 1 };
 	int dec_count = 1;
 	while (1)
 	{

nano/lib/formatting.cpp

@@ -1 +1,16 @@
 #include <nano/lib/formatting.hpp>
+
+namespace nano::log
+{
+std::ostream & operator<< (std::ostream & os, as_nano_formatter const & wrapper)
+{
+	nano::encode_balance (os, wrapper.value, nano::nano_ratio, wrapper.precision, true);
+	return os;
+}
+
+std::ostream & operator<< (std::ostream & os, as_raw_nano_formatter const & wrapper)
+{
+	os << wrapper.value;
+	return os;
+}
+}

nano/lib/formatting.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <nano/lib/numbers.hpp>
+#include <nano/lib/ratios.hpp>
 
 #include <boost/system/error_code.hpp>
 
@@ -124,22 +125,14 @@ struct as_nano_formatter
 	nano::uint128_t const & value;
 	int precision{ 1 };
 
-	friend std::ostream & operator<< (std::ostream & os, as_nano_formatter const & wrapper)
-	{
-		nano::encode_balance (os, wrapper.value, nano::nano_ratio, wrapper.precision, true);
-		return os;
-	}
+	friend std::ostream & operator<< (std::ostream & os, as_nano_formatter const & wrapper);
 };
 
 struct as_raw_nano_formatter
 {
 	nano::uint128_t const & value;
 
-	friend std::ostream & operator<< (std::ostream & os, as_raw_nano_formatter const & wrapper)
-	{
-		os << wrapper.value;
-		return os;
-	}
+	friend std::ostream & operator<< (std::ostream & os, as_raw_nano_formatter const & wrapper);
 };
 
 inline auto as_account (nano::public_key const & key)