Implement ice

[MEMOxiiii]

Adds ice, which melts into water when a neighbouring block is lit above light level 11 by a light source, drops only with Silk Touch and otherwise leaves water behind when a block supports it, and produces nothing in the Nether. Adds Tx.BlockLight since melting must ignore sky light and only Light and SkyLight existed.

[HashimTheArab]

1. server/block/ice.go:39-53

Please exclude Creative mode before converting the broken block to water. BreakHandler is still called for creative breaks, so ice over a supported block currently leaves a water source. Vanilla Creative ice simply disappears. Add a GameMode().CreativeInventory() guard.

2. server/block/ice.go:47-50

Please avoid using len(b.Model().BBox(...)) as the support predicate. BBox means “has collision,” not “is motion-blocking/solid”; partial blocks such as fences, ladders, beds, or cake can incorrectly cause ice to produce water. Match vanilla’s solid/motion-blocking-or-fluid check instead.

[MEMOxiiii]

1. server/block/ice.go:39-53

Please exclude Creative mode before converting the broken block to water. BreakHandler is still called for creative breaks, so ice over a supported block currently leaves a water source. Vanilla Creative ice simply disappears. Add a GameMode().CreativeInventory() guard.

2. server/block/ice.go:47-50

Please avoid using len(b.Model().BBox(...)) as the support predicate. BBox means “has collision,” not “is motion-blocking/solid”; partial blocks such as fences, ladders, beds, or cake can incorrectly cause ice to produce water. Match vanilla’s solid/motion-blocking-or-fluid check instead.

done