Enable log macros to work with no args (#4475)

This is enabled by the C++20 __VA_OPT__ feature.
Uses of "{}" format string were updated.
Some warning suppressions were required for older clang versions.
Also improve codegen of wpi::Logger::Log(), frc::ReportError(), and frc::MakeError();
these generate better and less redundant code if they use fmt::string_view for the
format string instead of templating on it.

wpilibNewCommands/src/main/native/cpp/frc2/command/CommandGroupBase.cpp

@@ -9,7 +9,7 @@ using namespace frc2;
 bool CommandGroupBase::RequireUngrouped(const Command& command) {
   if (command.IsGrouped()) {
     throw FRC_MakeError(
-        frc::err::CommandIllegalUse, "{}",
+        frc::err::CommandIllegalUse,
         "Commands cannot be added to more than one CommandGroup");
   }
   return true;
@@ -27,7 +27,7 @@ bool CommandGroupBase::RequireUngrouped(
   }
   if (!allUngrouped) {
     throw FRC_MakeError(
-        frc::err::CommandIllegalUse, "{}",
+        frc::err::CommandIllegalUse,
         "Commands cannot be added to more than one CommandGroup");
   }
   return allUngrouped;
@@ -41,7 +41,7 @@ bool CommandGroupBase::RequireUngrouped(
   }
   if (!allUngrouped) {
     throw FRC_MakeError(
-        frc::err::CommandIllegalUse, "{}",
+        frc::err::CommandIllegalUse,
         "Commands cannot be added to more than one CommandGroup");
   }
   return allUngrouped;

wpilibNewCommands/src/main/native/cpp/frc2/command/CommandScheduler.cpp

@@ -119,7 +119,7 @@ void CommandScheduler::Schedule(Command* command) {
   }
 
   if (command->IsGrouped()) {
-    throw FRC_MakeError(frc::err::CommandIllegalUse, "{}",
+    throw FRC_MakeError(frc::err::CommandIllegalUse,
                         "A command that is part of a command group "
                         "cannot be independently scheduled");
     return;

wpilibNewCommands/src/main/native/cpp/frc2/command/ParallelCommandGroup.cpp

@@ -65,7 +65,7 @@ void ParallelCommandGroup::AddCommands(
   }
 
   if (isRunning) {
-    throw FRC_MakeError(frc::err::CommandIllegalUse, "{}",
+    throw FRC_MakeError(frc::err::CommandIllegalUse,
                         "Commands cannot be added to a CommandGroup "
                         "while the group is running");
   }
@@ -77,7 +77,7 @@ void ParallelCommandGroup::AddCommands(
       m_runWhenDisabled &= command->RunsWhenDisabled();
       m_commands.emplace_back(std::move(command), false);
     } else {
-      throw FRC_MakeError(frc::err::CommandIllegalUse, "{}",
+      throw FRC_MakeError(frc::err::CommandIllegalUse,
                           "Multiple commands in a parallel group cannot "
                           "require the same subsystems");
     }

wpilibNewCommands/src/main/native/cpp/frc2/command/ParallelDeadlineGroup.cpp

@@ -60,7 +60,7 @@ void ParallelDeadlineGroup::AddCommands(
   }
 
   if (!m_finished) {
-    throw FRC_MakeError(frc::err::CommandIllegalUse, "{}",
+    throw FRC_MakeError(frc::err::CommandIllegalUse,
                         "Commands cannot be added to a CommandGroup "
                         "while the group is running");
   }
@@ -72,7 +72,7 @@ void ParallelDeadlineGroup::AddCommands(
       m_runWhenDisabled &= command->RunsWhenDisabled();
       m_commands.emplace_back(std::move(command), false);
     } else {
-      throw FRC_MakeError(frc::err::CommandIllegalUse, "{}",
+      throw FRC_MakeError(frc::err::CommandIllegalUse,
                           "Multiple commands in a parallel group cannot "
                           "require the same subsystems");
     }

wpilibNewCommands/src/main/native/cpp/frc2/command/ParallelRaceGroup.cpp

@@ -50,7 +50,7 @@ void ParallelRaceGroup::AddCommands(
   }
 
   if (isRunning) {
-    throw FRC_MakeError(frc::err::CommandIllegalUse, "{}",
+    throw FRC_MakeError(frc::err::CommandIllegalUse,
                         "Commands cannot be added to a CommandGroup "
                         "while the group is running");
   }
@@ -62,7 +62,7 @@ void ParallelRaceGroup::AddCommands(
       m_runWhenDisabled &= command->RunsWhenDisabled();
       m_commands.emplace_back(std::move(command));
     } else {
-      throw FRC_MakeError(frc::err::CommandIllegalUse, "{}",
+      throw FRC_MakeError(frc::err::CommandIllegalUse,
                           "Multiple commands in a parallel group cannot "
                           "require the same subsystems");
     }

wpilibNewCommands/src/main/native/cpp/frc2/command/SequentialCommandGroup.cpp

@@ -60,7 +60,7 @@ void SequentialCommandGroup::AddCommands(
   }
 
   if (m_currentCommandIndex != invalid_index) {
-    throw FRC_MakeError(frc::err::CommandIllegalUse, "{}",
+    throw FRC_MakeError(frc::err::CommandIllegalUse,
                         "Commands cannot be added to a CommandGroup "
                         "while the group is running");
   }