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

wpilibc/src/main/native/include/frc/RobotBase.h

@@ -11,7 +11,6 @@
 #include <hal/Main.h>
 #include <wpi/condition_variable.h>
 #include <wpi/mutex.h>
-#include <wpi/raw_ostream.h>
 
 #include "frc/Errors.h"