[Idea] Adjust/missing sounds

[Mecheon]

Hello

At present, from my brief playthrough, there doesn't seem to be any stepping sounds for glitter grass or splash sounds for mineral water. Tree leaves make the appropriate sounds once broken, but the lack of noise for landing it water seems off, and the lack of noise when walking on grass can make the area feel a bit dead

A custom edited version of the grass sound effect, edited to sound like crinkling crystals or similar, could help assit the overall crystal aesthetic of the land.

[Andromander]

Something I will note is that, at the moment, I don't have control over all fluid sound effects. This is due to an incomplete Fluid API not having access to all sounds that a fluid can create, ie. splashing and swimming sounds. See #125 (comment) for more info.
Custom SoundTypes might be out of scope due to a lack of sfx editing and experience.

Just so I've got a list to keep track of for myself, might add more as I go:

• Remove all instances of Grass SoundType, the dimension is made of crystals, rocks, or glass.
• Add stepping sounds for certain blocks similar to Amethyst Block.
• (When implemented) Splash sounds for certain fluids.
• Mud SoundType for Impure Sludge, maybe Boggy Soil.