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

hal/src/main/native/cpp/jni/simulation/SpiReadAutoReceiveBufferCallbackStore.cpp

@@ -6,6 +6,8 @@
 
 #include <jni.h>
 
+#include <cstdio>
+
 #include <wpi/jni_util.h>
 
 #include "SimulatorJNI.h"
@@ -47,13 +49,13 @@ int32_t SpiReadAutoReceiveBufferCallbackStore::performCallback(
     didAttachThread = true;
     if (vm->AttachCurrentThread(reinterpret_cast<void**>(&env), nullptr) != 0) {
       // Failed to attach, log and return
-      wpi::outs() << "Failed to attach\n";
-      wpi::outs().flush();
+      std::puts("Failed to attach");
+      std::fflush(stdout);
       return -1;
     }
   } else if (tryGetEnv == JNI_EVERSION) {
-    wpi::outs() << "Invalid JVM Version requested\n";
-    wpi::outs().flush();
+    std::puts("Invalid JVM Version requested");
+    std::fflush(stdout);
   }
 
   auto toCallbackArr = MakeJIntArray(