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

simulation/halsim_gui/src/main/native/cpp/HALProvider.cpp

@@ -56,7 +56,7 @@ void HALProvider::Update() {
   }
 }
 
-glass::Model* HALProvider::GetModel(wpi::StringRef name) {
+glass::Model* HALProvider::GetModel(std::string_view name) {
   auto it = FindModelEntry(name);
   if (it == m_modelEntries.end() || (*it)->name != name) {
     return nullptr;