Progressively reveal the map to the player

As the character walks around the map, progressively reveal the entities
on the map to them, using an algorithm based on well known
circle-rasterizing and line-rasterizing algorithms to calculate lines of
sight that are potentially obscured by walls.

xanthous.cabal

@@ -4,7 +4,7 @@ cabal-version: 1.12
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: a79caccff8895730c394c19244f068830759636d17f55f3b6d1d8a9ebe43ecdd
+-- hash: 86b7d3047b95fc65f4c6489a21e8c89883981c8c5bd552b5ea83aaf70de8a7cf
 
 name:           xanthous
 version:        0.1.0.0
@@ -34,6 +34,7 @@ library
       Xanthous.Command
       Xanthous.Data
       Xanthous.Data.EntityMap
+      Xanthous.Data.EntityMap.Graphics
       Xanthous.Entities
       Xanthous.Entities.Arbitrary
       Xanthous.Entities.Character
@@ -55,6 +56,7 @@ library
       Xanthous.Random
       Xanthous.Resource
       Xanthous.Util
+      Xanthous.Util.Graphics
   other-modules:
       Paths_xanthous
   hs-source-dirs:
@@ -102,6 +104,7 @@ executable xanthous
       Xanthous.Command
       Xanthous.Data
       Xanthous.Data.EntityMap
+      Xanthous.Data.EntityMap.Graphics
       Xanthous.Entities
       Xanthous.Entities.Arbitrary
       Xanthous.Entities.Character
@@ -123,6 +126,7 @@ executable xanthous
       Xanthous.Random
       Xanthous.Resource
       Xanthous.Util
+      Xanthous.Util.Graphics
       Paths_xanthous
   hs-source-dirs:
       src
@@ -174,6 +178,7 @@ test-suite test
       Xanthous.Generators.UtilSpec
       Xanthous.MessageSpec
       Xanthous.OrphansSpec
+      Xanthous.Util.GraphicsSpec
       Paths_xanthous
   hs-source-dirs:
       test