Environment Content Update

Newly Added Maker Tiles:

• Environment Generators (6) - Gives the room a hazardous environment that either does damage or prevents visibility while in the room.
• Environment Armor Upgrades (6) - Protects against the corresponding environmental hazard.
• Polarity Blocks (2) and Polarity Switches (3) - Blocks and switches that operate on "on/off" logic.
• Arrow Signs (8) - Directional arrows that silently hang from the background.

Fixes and Improvements:

• Starting Items selection now allows selecting 0-8 of each stackable upgrade (instead of only allowing 0 or 8).
• Starting Items selection now has an option to select All or None of the upgrades through a single click.
• Tweaked the Demo World.
• Tweaked the Maker Mode GUI layout.
• Other assorted bug fixes.