Blindness

First release on CurseForge (beta).

• Full blindness: the world goes black and every audible sound sends out a wave that reveals the outlines around it, with a sonar ring on the ground (can be turned off) and patterns for water and lava.
• One blind eye (left or right) with three styles: stretched, dark or blurred.
• Optional Simple Voice Chat support (2.5.0+): proximity voices make waves too.
• In-game settings screen (key O) with a help panel; F8 toggles blindness.

Fixed in this version: the minimum wave radius can no longer be set above the maximum.