Replaced STL streams with LLVM's raw_ostream (#344)

std::cout and std::printf were replaced with llvm::outs() and std::cerr was replaced with llvm::errs().

wpilibc/shared/src/Commands/PrintCommand.cpp

@@ -7,7 +7,7 @@
 
 #include "Commands/PrintCommand.h"
 
-#include <iostream>
+#include "llvm/raw_ostream.h"
 
 using namespace frc;
 
@@ -16,4 +16,4 @@ PrintCommand::PrintCommand(const std::string& message)
   m_message = message;
 }
 
-void PrintCommand::Initialize() { std::cout << m_message << "\n"; }
+void PrintCommand::Initialize() { llvm::outs() << m_message << "\n"; }

wpilibc/shared/src/Commands/Scheduler.cpp

@@ -8,7 +8,6 @@
 #include "Commands/Scheduler.h"
 
 #include <algorithm>
-#include <iostream>
 #include <set>
 
 #include "Buttons/ButtonScheduler.h"