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

wpilibc/src/main/native/include/frc/SerialPort.h

@@ -144,7 +144,7 @@ class SerialPort {
    * Use Write({data, len}) to get a buffer that is shorter than the length of
    * the string.
    *
-   * @param buffer StringRef to the buffer to read the bytes from.
+   * @param buffer the buffer to read the bytes from.
    * @return The number of bytes actually written into the port.
    */
   int Write(std::string_view buffer);