Feature description

An ice trap block that breaks when stepped on. Has stair/slab variants. Should look subtle visually distinct from regular Ice, like Power Snow, perhaps using the Frosted Ice texture (so more likely for the trap to still work with custom texture packs).

Checklist:

• Brittle Ice Block
• Brittle Ice Stairs not doing this
• Brittle Ice Slab not doing this
• Melts into air
• Sound when cracking
• Craftable from icicles, replacing old icicle -> ice recipe
• Drop when silk touched