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/README.md

@@ -0,0 +1,29 @@
+## Simulation Directory
+
+Observe the following directory structure
+
+.
+|-- frc_gazebo_plugins (contains Gazebo Plugins)
+|   |-- clock
+|   |-- dc_motor
+|   |-- encoder
+|   |-- gyro
+|   |-- plugins
+|   |-- pneumatic_piston
+|   |-- potentiometer
+|   |-- rangefinder
+|   |-- servo
+|
+|-- frcsim.bat (launches gazebo with model/plugin paths on windows)
+|-- frcsim.sh (launches gazebo with model/plugin paths on linux/mac)
+|-- install.sh (convenient linux script to install Eclipse, Eclipse Plugins, and Gazebo)
+|-- JavaGazebo (java library used by java simulation. Equivelant of the C++ gazebo_transport)
+|-- SimDS (linux driverstation)
+
+The gazbeo plugins are currently built with CMake.
+Eventually they will be built with gradle.
+
+All of this is delivered to students via the eclipse plugins
+
+## Building
+see the top level building.md