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/linux/UsbUtil.h

@@ -5,15 +5,11 @@
 #ifndef CSCORE_USBUTIL_H_
 #define CSCORE_USBUTIL_H_
 
-#include <stdint.h>
-
-#include <wpi/SmallVector.h>
-#include <wpi/StringRef.h>
+#include <string>
 
 namespace cs {
 
-wpi::StringRef GetUsbNameFromId(int vendor, int product,
-                                wpi::SmallVectorImpl<char>& buf);
+std::string GetUsbNameFromId(int vendor, int product);
 
 int CheckedIoctl(int fd, unsigned long req, void* data,  // NOLINT(runtime/int)
                  const char* name, const char* file, int line, bool quiet);