Make description pass through to roomstate
Update Game class

Added "description" placeholder _globalkeys[0]. Pushed all other
_globalkeys up one.

Added the rest of the UtopiaScript function stubs.

Wrote Game::usLoadGame(). Resolves #19.
Wrote Game::usPrint() and Game::usPrintln(). Resolves #10.
Wrote Game::usInventory(). Resolves #38.