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

cscore/src/main/native/cpp/RawSourceImpl.cpp

@@ -14,7 +14,7 @@
 
 using namespace cs;
 
-RawSourceImpl::RawSourceImpl(const wpi::Twine& name, wpi::Logger& logger,
+RawSourceImpl::RawSourceImpl(std::string_view name, wpi::Logger& logger,
                              Notifier& notifier, Telemetry& telemetry,
                              const VideoMode& mode)
     : ConfigurableSourceImpl{name, logger, notifier, telemetry, mode} {}
@@ -47,7 +47,7 @@ void RawSourceImpl::PutFrame(const CS_RawFrame& image) {
 }
 
 namespace cs {
-CS_Source CreateRawSource(const wpi::Twine& name, const VideoMode& mode,
+CS_Source CreateRawSource(std::string_view name, const VideoMode& mode,
                           CS_Status* status) {
   auto& inst = Instance::GetInstance();
   return inst.CreateSource(CS_SOURCE_RAW, std::make_shared<RawSourceImpl>(