Factor out an EntityAttributes type

Factor out a new EntityAttributes type from some of the methods of the
Entity class, to avoid the proliferation of 1-argument boolean methods
on the entity class that always have to be forwarded through the Entity
instance for SomeEntity if they have defaults (forgetting to do which
has wasted tons of my time up to this point). Currently blocksVision,
blocksObject, and collision are all in there.

xanthous.cabal

@@ -4,7 +4,7 @@ cabal-version: 1.12
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: eb0a7cd56cc2ea885be582c8ea7113a5f50f96a8d1b12ed27ca1a0271a45ad03
+-- hash: 09d294830fde12021527c15ba1e1698afdec092a16c4171ee67dce3256fe0d96
 
 name:           xanthous
 version:        0.1.0.0
@@ -34,6 +34,7 @@ library
       Xanthous.App
       Xanthous.Command
       Xanthous.Data
+      Xanthous.Data.Entities
       Xanthous.Data.EntityChar
       Xanthous.Data.EntityMap
       Xanthous.Data.EntityMap.Graphics
@@ -141,6 +142,7 @@ executable xanthous
       Xanthous.App
       Xanthous.Command
       Xanthous.Data
+      Xanthous.Data.Entities
       Xanthous.Data.EntityChar
       Xanthous.Data.EntityMap
       Xanthous.Data.EntityMap.Graphics
@@ -245,6 +247,7 @@ test-suite test
   main-is: Spec.hs
   other-modules:
       Test.Prelude
+      Xanthous.Data.EntitiesSpec
       Xanthous.Data.EntityCharSpec
       Xanthous.Data.EntityMap.GraphicsSpec
       Xanthous.Data.EntityMapSpec