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/BuiltInAccelerometer.cpp

@@ -23,7 +23,7 @@ BuiltInAccelerometer::BuiltInAccelerometer(Range range) {
 
 void BuiltInAccelerometer::SetRange(Range range) {
   if (range == kRange_16G) {
-    throw FRC_MakeError(err::ParameterOutOfRange, "{}",
+    throw FRC_MakeError(err::ParameterOutOfRange,
                         "16G range not supported (use k2G, k4G, or k8G)");
   }