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.

wpilibc/src/main/native/cpp/DutyCycleEncoder.cpp

@@ -105,7 +105,7 @@ units::turn_t DutyCycleEncoder::Get() const {
   }
 
   FRC_ReportError(
-      warn::Warning, "{}",
+      warn::Warning,
       "Failed to read DutyCycle Encoder. Potential Speed Overrun. Returning "
       "last value");
   return m_lastPosition;