scripted-diff: Rename MainSignals to ValidationSignals

-BEGIN VERIFY SCRIPT-
s() { git grep -l "$1" src | xargs sed -i "s/$1/$2/g"; }

s 'CMainSignals'    'ValidationSignals'
s 'MainSignalsImpl' 'ValidationSignalsImpl'
-END VERIFY SCRIPT-

src/node/context.h

@@ -20,7 +20,7 @@ class BanMan;
 class BaseIndex;
 class CBlockPolicyEstimator;
 class CConnman;
-class CMainSignals;
+class ValidationSignals;
 class CScheduler;
 class CTxMemPool;
 class ChainstateManager;
@@ -74,7 +74,7 @@ struct NodeContext {
     //! Issues blocking calls about sync status, errors and warnings
     std::unique_ptr<KernelNotifications> notifications;
     //! Issues calls about blocks and transactions
-    std::unique_ptr<CMainSignals> validation_signals;
+    std::unique_ptr<ValidationSignals> validation_signals;
     std::atomic<int> exit_status{EXIT_SUCCESS};
 
     //! Declare default constructor and destructor that are not inline, so code

src/node/interfaces.cpp

@@ -460,7 +460,7 @@ public:
 class NotificationsHandlerImpl : public Handler
 {
 public:
-    explicit NotificationsHandlerImpl(CMainSignals& signals, std::shared_ptr<Chain::Notifications> notifications)
+    explicit NotificationsHandlerImpl(ValidationSignals& signals, std::shared_ptr<Chain::Notifications> notifications)
         : m_signals{signals}, m_proxy{std::make_shared<NotificationsProxy>(std::move(notifications))}
     {
         m_signals.RegisterSharedValidationInterface(m_proxy);
@@ -473,7 +473,7 @@ public:
             m_proxy.reset();
         }
     }
-    CMainSignals& m_signals;
+    ValidationSignals& m_signals;
     std::shared_ptr<NotificationsProxy> m_proxy;
 };
 
@@ -823,7 +823,7 @@ public:
     NodeContext* context() override { return &m_node; }
     ArgsManager& args() { return *Assert(m_node.args); }
     ChainstateManager& chainman() { return *Assert(m_node.chainman); }
-    CMainSignals& validation_signals() { return *Assert(m_node.validation_signals); }
+    ValidationSignals& validation_signals() { return *Assert(m_node.validation_signals); }
     NodeContext& m_node;
 };
 } // namespace