Introduce Game struct

Motivation: SIOF is such a huge chore to work around at this point
that it's probably best to just start the looong task of getting rid
of the globals.

Currently we allocate a single global Game instance which we leak. The
idea here is to start moving global game state into the single global
Game singleton and eventually allocating the Game variable on the
stack such that everything works out nicely wrt. freeing allocated
memory and such.

Once all the game state has been moved into Game we can start plumbing
all the functions, classes, &c such that we don't have to reference
game state via the "game" global.

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