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/cpp/shuffleboard/ShuffleboardTab.cpp

@@ -6,7 +6,7 @@
 
 using namespace frc;
 
-ShuffleboardTab::ShuffleboardTab(ShuffleboardRoot& root, wpi::StringRef title)
+ShuffleboardTab::ShuffleboardTab(ShuffleboardRoot& root, std::string_view title)
     : ShuffleboardValue(title), ShuffleboardContainer(title), m_root(root) {}
 
 ShuffleboardRoot& ShuffleboardTab::GetRoot() {