Use std::string_view and fmtlib across all libraries (#3402)

- Twine, StringRef, Format, and NativeFormatting have been removed
- Logging now uses fmtlib style formatting
- Nearly all uses of wpi::outs/errs have been replaced with fmt::print() or
std::puts()/std::fputs() (for unformatted strings).
- A wpi/fmt/raw_ostream.h header has been added to enable
fmt::print() with wpi::raw_ostream

wpimath/src/main/native/include/frc/spline/SplineParameterizer.h

@@ -33,8 +33,6 @@
 #include <utility>
 #include <vector>
 
-#include <wpi/Twine.h>
-
 #include "frc/spline/Spline.h"
 #include "units/angle.h"
 #include "units/curvature.h"