Comment Typo

Fixed a typo ("play" => "place") in packet.hpp.
Hash Bug

Fixed a bug in the std::hash specialization for tuples which was
preventing compilation.
Style Fix

Removed "this->" from a reference to "max" in the TerrainGenerator
class.

This qualification is no longer necessary as the name is not shadowed,
and therefore its presence goes against the style being used throughout
the project.
Begin World Rewrite

Started rewrite of the world management module.

Functionality related to generation (tying in the work that's been done
on terrain generation) of columns, serialization, and miscellaneous
objects needed to describe columns/blocks/etc. has been implemented but
not tested.