PWM: Use getRaw and setRaw for Sendable "Value" property. (#963)

Also change type to "PWM".  Move old PWM Sendable behavior for both value
and type to PWMSpeedController.

wpilibc/src/main/native/cpp/PWMSpeedController.cpp

@@ -7,6 +7,8 @@
 
 #include "PWMSpeedController.h"
 
+#include "SmartDashboard/SendableBuilder.h"
+
 using namespace frc;
 
 /**
@@ -52,3 +54,10 @@ void PWMSpeedController::StopMotor() { SafePWM::StopMotor(); }
  * @param output Write out the PWM value as was found in the PIDController
  */
 void PWMSpeedController::PIDWrite(double output) { Set(output); }
+
+void PWMSpeedController::InitSendable(SendableBuilder& builder) {
+  builder.SetSmartDashboardType("Speed Controller");
+  builder.SetSafeState([=]() { SetDisabled(); });
+  builder.AddDoubleProperty("Value", [=]() { return GetSpeed(); },
+                            [=](double value) { SetSpeed(value); });
+}