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

wpilibNewCommands/src/main/native/cpp/frc2/command/PrintCommand.cpp

@@ -4,13 +4,13 @@
 
 #include "frc2/command/PrintCommand.h"
 
-#include <wpi/raw_ostream.h>
+#include <fmt/format.h>
 
 using namespace frc2;
 
 PrintCommand::PrintCommand(std::string_view message)
-    : CommandHelper{
-          [str = std::string(message)] { wpi::outs() << str << "\n"; }, {}} {}
+    : CommandHelper{[str = std::string(message)] { fmt::print("{}\n", str); },
+                    {}} {}
 
 bool PrintCommand::RunsWhenDisabled() const {
   return true;