Unrealcv

- Commands contributed in pull request `91`, authored by `bennihepp`
- Add `vget /camera/[id]/pose`, `vset /camera/[id]/pose`
- Add `vget/vset /camera/[id]/horizontal_fieldofview`
- Add `vget /camera/[id]/vis_depth npy` and `vget /camera/[id]/plane_depth npy`
- Add `vset /object/[id]/show`, `vset /object/[id]/hide`
- Add `vset /action/input/enable`, `vset /action/input/disable`

- Add more commands
- Add `vget /object/[id]/mobility`, `vget /object/[id]/location`, `vget /object/[id]/rotation`
- Add `vget /camera/[id]/normal npy`
- Add `vset /action/eyes_distance [eye_distance]`
- Add `vset /action/game/pause`

- Update the python client to support python3
- Improve documentation

The binary is built for Unreal Engine 4.16. If you need a binary for a different engine version, please follow the compile instruction [here](http://docs.unrealcv.org/en/master/plugin/install.html#compile-from-source-code)

See docs/CHANGELOG.rst.

Update Details:
- Add support for Unreal 4.13, 4.14
- Stability improvement, fix crash caused by the usage of GWorld
- Fix some incorrect ground truth, blueprint actor not correctly displayed.
- Add playground project
- Add docs to docs.unrealcv.org
- Add API documentation created by doxygen
- Fix an issue that prevents the packaging of games.
- Add vrun command to exec UE4 built-in command

API update:
- vrun [built-in command]
- vset /camera/[id]/moveto [x] [y] [z] With collision enabled

Features
- Add communication to UE4Editor and a compiled game
- Add Python and MATLAB client to communicate with UnrealCV server
- Add ground truth extraction, include: depth, object-mask, surface normal
- Add support for Linux, Win and Mac

Initial API, see details [here](https://unrealcv.github.io/reference/commands.html)
- `vget /objects`
- `vget /object/[obj_name]/color`
- `vset /object/[obj_name]/color [r] [g] [b]`
- `vget /camera/[id]/location`
- `vget /camera/[id]/rotation`
- `vset /camera/[id]/location [x] [y] [z]`
- `vset /camera/[id]/rotation [pitch] [yaw] [roll]`
- `vget /camera/[id]/[viewmode]`
- `vget /camera/[id]/[viewmode] [filename]`
- `vset /viewmode [viewmode]`
- `vget /viewmode`
- `vget /unrealcv/status`
- `vget /unrealcv/help`

The upcoming release will follow the concept of [Semantic Versioning](http://semver.org/)

Provide the basic functions.
Ground truth generation provided by buffer visualization of UE4.