Move core logic files to game

spec/expansion_spec.cr

@@ -1,6 +1,6 @@
 require "./spec_helper"
-require "./../src/map"
-require "./../src/queue"
+require "./../src/game/map"
+require "./../src/game/queue"
 
 describe Point do
   p1 = Point.new(0, 0)

spec/queue_spec.cr

@@ -1,6 +1,6 @@
 require "./spec_helper"
-require "./../src/queue"
-require "./../src/command"
+require "./../src/game/queue"
+require "./../src/game/command"
 
 macro define_dummy_classes(count)
   {% for i in (1...count) %}

spec/world_spec.cr

@@ -1,5 +1,5 @@
 require "./spec_helper"
-require "../src/world"
+require "../src/game/world"
 
 describe "World" do
   it "should build crystal harvester" do

src/expansion.cr

@@ -1,9 +1,8 @@
-require "colorize"
-require "./command"
-require "./map"
-require "./queue"
-require "./resources"
-require "./world"
+require "./game/command"
+require "./game/map"
+require "./game/queue"
+require "./game/resources"
+require "./game/world"
 
 UserWorld = World.new