QOL Mycel & Grass changes

[MozzarellaRat]

Makes Mycel tillable
Makes Grass & Mycel decay with a block over them
Makes sugarcane placeable on mycel

Description

This PR adds quality of life features to grass & mycel.

Changes & New Behavior

This PR adds the ability for:

• Mycel & Grass to decay under a solid block, or water
• Mycel to be tillable
• Sugarcane to place on mycel

Previous Behavior

Grass & Mycel would not decay under a block

AI Use Disclosure

Github Copilot was used to find the sugarcane tile file. It was under a different name (ReedTile.cpp) which caused confusion.

[MozzarellaRat]

I understand if the tilling & sugarcane placement doesn't align with the current project goals as they are more of additions, but I still think decaying under another block should be added. If it doesn't align with the project's goals tell me and I will remove those changes.