Plan out project structure

chunks.py

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+class ChunkDiff():
+	"""
+	Represents differences between two chunks (changes to be made to a chunk).
+	Can be used to transform a chunk into another chunk.
+	"""
+	
+	pass
+
+class Chunk():
+	"""
+	Represents a chunk (16x8 characters on the map).
+	Is able to generate diffs
+	 - from another chunk
+	 - from direct changes
+	 - from accumulated changes
+	"""
+	
+	pass
+
+class ChunkPool():
+	"""
+	Is a collection of chunks.
+	Allows user to manage (get, modify, delete) chunks, keeps track of chunks for them.
+	Load chunks it doesn't know.
+	"""
+	
+	pass