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

wpilibOldCommands/src/main/native/cpp/commands/PrintCommand.cpp

@@ -5,7 +5,6 @@
 #include "frc/commands/PrintCommand.h"
 
 #include <fmt/format.h>
-#include <wpi/raw_ostream.h>
 
 using namespace frc;
 
@@ -15,5 +14,5 @@ PrintCommand::PrintCommand(std::string_view message)
 }
 
 void PrintCommand::Initialize() {
-  wpi::outs() << m_message << '\n';
+  fmt::print("{}\n", m_message);
 }