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

wpiutil/src/main/native/include/wpi/TCPAcceptor.h

@@ -27,6 +27,7 @@
 #include <atomic>
 #include <memory>
 #include <string>
+#include <string_view>
 
 #include "wpi/NetworkAcceptor.h"
 #include "wpi/TCPStream.h"
@@ -44,7 +45,7 @@ class TCPAcceptor : public NetworkAcceptor {
   Logger& m_logger;
 
  public:
-  TCPAcceptor(int port, const char* address, Logger& logger);
+  TCPAcceptor(int port, std::string_view address, Logger& logger);
   ~TCPAcceptor() override;
 
   int start() override;