Echo Glass: a way to block the warden's sonic attack without adding cheese.

Echo glass would be made with some combination of glass or tinted glass, and echo shards. The main purpose of it would be if someone wanted to display the warden, and there could also be other uses with the anti-cheese and other mechanics further in the post.

The warden's sonic attack passes through all blocks, but would not be able to pass through echo glass. This is still balanced and does not introduce a way to cheese the warden, because trying to use echo glass to avoid it would waste more than you would gain from multiple ancient cities.

Some further anti-cheese and other mechanics for it could include:

- Sends vibrations from further away when placing/breaking
- Cannot be picked back up even with silk touch
- Sculk shriekers activated by it would summon the warden with only one activation
- While it gives off much more vibrations itself, something surrounded in it would be completely silent similar to how tinted glass blocks all light
- Extremely brittle and breaks over time similar to how copper oxidizes. It slowly repairs itself over time when in full skylight, and right clicking it with an echo shard protects it for some amount of time