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

cameraserver/src/main/native/include/cameraserver/CameraServer.inc

@@ -19,7 +19,7 @@ inline cs::AxisCamera CameraServer::AddAxisCamera(
 
 template <typename T>
 inline cs::AxisCamera CameraServer::AddAxisCamera(
-    const wpi::Twine& name, std::initializer_list<T> hosts) {
+    std::string_view name, std::initializer_list<T> hosts) {
   std::vector<std::string> vec;
   vec.reserve(hosts.size());
   for (const auto& host : hosts) {