Ramming speed!

Updates

• Remove the "Not equipped" text from the inventory UI.
• Entity inventory has been upgraded from a list to an Inventory object.
• Inventory slots are now composed of ItemStack objects in place of raw Items.
• The overworld has arrived!  Read the sign for more info.
• rangeOfVision = perception / 2.
• Use the "e" key followed by an arrow to examine the tile in that direction.
• Use the ";" key to activate a selection cursor.  Move the cursor around to inspect a tile.  `enter` for more details.
• Used page flipping to get a good performance boost, and knock out the jagged entity movement bug.
• Bonus: The game is almost playable from the browser!

Known Bugs

• If you crash the game then immediately restart it, it gets really laggy and has rendering artifacts.
• Probably related to page flipping.