Haskell bindings to Urho3D engine

• Partial bindings
• Sample class is ported to Haskell
• 9 samples are ported (total is 46).
• Custom logic components in Haskell
• Shared pointers support

Urho3D was configured with following options for development of the bindings:

git clone https://github.com/urho3d/Urho3D.git
cd Urho3D
mkdir build
cd build

cmake .. -DURHO3D_SAMPLES=1 -DURHO3D_EXTRAS=1 -DURHO3D_LIB_TYPE=SHARED -DCMAKE_INSTALL_PREFIX:PATH=/usr

make
sudo make install

Urho3D commit the bindings are tested with: b0f2b5a94f567465bfb1f88427e5e2924552a2bb

Also you need to adjust paths at the end of stack.yml:

extra-lib-dirs:
- /usr/lib64/Urho3D
extra-include-dirs:
- /usr/include
- /usr/include/Urho3D/ThirdParty

And you need to setup URHO3D_PREFIX_PATH environment variable to run samples. For instance:

URHO3D_PREFIX_PATH=/usr/share/Urho3D/Resources

You need stack:

1. stack install

You can enable debugging printing for shared pointers with:

stack install --flag urho3d-haskell:debug-shared

In order to build examples:

stack install --flag urho3d-haskell:examples