Litematica

• fix: restore placementReplaceBehavior (NOT pasteReplaceBehavior) logic to WorldPlacingUtils for use with the ProtoChunk loading process.
• apply RenderData locks; and Chunk Renderer Lock from 26.1
• fix chunk rendering by adding a new Chunk Render Update defer system;
• add logic for smarter targeted control when Chunk Rebuild/Unload tasks should be executed. This should help with lag, and Chunk "Tearing" due to using the Rebuild task Thread.
• The above should also help with memory leaks caused by this.

• 26.1.1
• fix a few rendering issues; particularly with Render As Translucent, and timing of resource pack loading / Video settings, such as with Sodium (WIP).
• Disable Legacy Terrain Shader RGSS code.

NOTE: As of my testing; the majority of "Texture" problems are caused by editing Minecraft's Video settings, and the Texture's aren't reloaded yet. Using renderBlocksAsTranslucent can also cause this, or simply using Sodium's Video config menu makes this harder to detect; so whenever you see "wrong" textures; use F3 + T to reload your block models so Litematica can rebuild it's Texture / Block Model cache.

• 26.1 -- A lot needed to change in the World Rendering system, particularly concerning Buffers, Block Model fetching, Vanilla renderer compatibility, Block Model Rendering, Ambient Occlusion changes; and several Render Pipeline adjustments.

NOTE: Consider this a BETA release considering the large amount of Rendering changes.

• fix: Placement manager thread tear downs in between dimensions (Ender Pearls, etc)
• fix: add several places where invalid file names could be introduced.

• Thread sleep / FIXER task reduction for allowing the thread to sleep. Placement toggles now fully unloads the chunks.
• Cap Max PM Threads to 2.
• Various optimizations to get the threads to sleep whenever there is no work.
• Add Main Rendering Toggle callback for clearing out the Placement Manager Chunks and stopping the Thread; (Or Restarting it)
• SchematicPlacement: Fix getSubRegionBoxes() not checking... the main placement enabled state. (@maruohon )
• fix: schematic placement toJson() if somehow we lost the origin point... (?)
• Add logic to ignore Water with Pick Block on a schematic; as requested by PearlescentMoon

NOTE: This release was in the oven for a long time to try to Beta test and tweak various PM Thread settings to reduce CPU usage. The CPU usage will still be a thing as long as the Thread has work; but it should go to sleep in less than a second after. Sleeping lasts 10 minutes max; and if it see's no tasks; it goes back to sleep.