merged from frcsim branch

verified to work on real robots
adds sim eclipse plugins, fixed JavaGazebo, made wpilibC++Sim build on windows
 - Java and C++ simulation robot programs run on windows
 - simulation eclipse plugin delivers models and gazebo plugins
 - Java Gazebo now respects GAZEBO_IP variables and can work across networks
 - hal and network tables win32 hacked to work on windows
 - smart dashboard broken on windows due to network tables hacks
 - wpilibC++Sim, gz_msgs, and frcsim_gazebo_plugins build with CMake
 - removed constexpr for cross platform compatibility
 - msgs generated using .protos as a part of build process
 - some spare and unused cmake/pom files deleted
 - simulation ubuntu debians removed entirely
 - refactored CMake project flags and macros
 - updated to match non-sim C++ API
 - fixed and updated documentation
 - servo added to simulation

Change-Id: Ia702ff0f1fee10d77f543810ad88f56696443b05

simulation/frc_gazebo_plugins/potentiometer/src/potentiometer.cpp

@@ -1,10 +1,15 @@
+#ifdef _WIN32
+  // Ensure that Winsock2.h is included before Windows.h, which can get
+  // pulled in by anybody (e.g., Boost).
+  #include <Winsock2.h>
+#endif
+
 #include "potentiometer.h"
 
 #include <gazebo/physics/physics.hh>
 #include <gazebo/transport/transport.hh>
 #include <boost/algorithm/string.hpp>
 
-#include "msgs/msgs.h"
 
 GZ_REGISTER_MODEL_PLUGIN(Potentiometer)
 
@@ -22,7 +27,7 @@ void Potentiometer::Load(physics::ModelPtr model, sdf::ElementPtr sdf) {
   } else {
     topic = "~/"+sdf->GetAttribute("name")->GetAsString();
   }
-  
+
   if (sdf->HasElement("units")) {
     radians = sdf->Get<std::string>("units") != "degrees";
   } else {