Data Tags: Add some null checks when converting to/from vanilla NBT

ListData: Add a `set()` method

Data tags: Add the forgotten equals() and hashCode() methods

Rendering: Rename Nine/Four "Spliced" to "Sliced"

ConfigOption: Fix one JavaDoc

BlockPos: Fix `fromPacked()` being broken in two ways...

Add configs for bypassing inventory blocked or locked checks for preview

InventoryRenderUtils: Fix dynamic size inventory background rendering

InventoryRenderUtils.getInventoryType(): Fix single chests...

One code style cleanup not worth this long of a comment

One comment/JavaDoc update

Configs: Use hasOverride() & isLocked() getters instead of the fields

BaseConfig: Remove the unused `locked` field

JsonUtils: Add a getAxis() helper method

Direction.Axis: Add value cycle methods