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/osx/UsbCameraImpl.cpp

@@ -6,19 +6,19 @@
 
 namespace cs {
 
-CS_Source CreateUsbCameraDev(const wpi::Twine& name, int dev,
+CS_Source CreateUsbCameraDev(std::string_view name, int dev,
                              CS_Status* status) {
   *status = CS_INVALID_HANDLE;
   return 0;
 }
 
-CS_Source CreateUsbCameraPath(const wpi::Twine& name, const wpi::Twine& path,
+CS_Source CreateUsbCameraPath(std::string_view name, std::string_view path,
                               CS_Status* status) {
   *status = CS_INVALID_HANDLE;
   return 0;
 }
 
-void SetUsbCameraPath(CS_Source source, const wpi::Twine& path,
+void SetUsbCameraPath(CS_Source source, std::string_view path,
                       CS_Status* status) {
   *status = CS_INVALID_HANDLE;
 }