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

wpilibc/wpilibC++Sim/src/IterativeRobot.cpp

@@ -3,16 +3,19 @@
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in $(WIND_BASE)/WPILib.  */
 /*----------------------------------------------------------------------------*/
-
 #include "IterativeRobot.h"
 
 #include "DriverStation.h"
 #include "SmartDashboard/SmartDashboard.h"
 #include "LiveWindow/LiveWindow.h"
 #include "networktables/NetworkTable.h"
-#include <unistd.h>
 
-constexpr double IterativeRobot::kDefaultPeriod;
+//not sure what this is used for yet.
+#ifdef _UNIX
+	#include <unistd.h>
+#endif
+
+const double IterativeRobot::kDefaultPeriod = 0;
 
 /**
  * Set the period for the periodic functions.