Server-controlled 3D objects, armor mesh support, and vehicle fixes

3D objects

• Control each placed shader object's state, timing, movement, rotation, and size, with smooth client-side animation.
• Create sequences that combine object changes, waits, sounds, commands, removal, and restarts.
• Spawn objects at coordinates from the console or command blocks. All /rp object actions now work from command blocks and through execute as <entity>.
• State and sequence commands now target the nearest object that supports the requested state or sequence.
• Set separate permissions for each /rp object action.
• Added portal, meteor, and black hole examples with states and sequences.
• Fixed rendering around triangle edges on driven 3D objects.

Dialogs

• Studio dialogs can show icons from your server's own resource pack, pasted in or named by RP Engine icon id.

Portal scenes

• Fixed floating tree sections and shimmering in the snowy pine scene.
• Replaced the odd-world scene with a Manhattan avenue, including buildings, street traffic, and the Empire State Building.

3D armor

• Armor models now support Blockbench mesh elements.
• Set shader-helmet: true to render a set's helmet through shaders.
• Fixed one wearer's armor failure preventing armor updates for other players.
• Fixed armor displays not being hidden correctly when a viewer quickly rejoins.

Resource packs

• Fixed quitting and rejoining during the initial skin wait leaving the new session without its resource packs.

Vehicles

• Fixed holdOccupant blocking dismounts caused by death, teleporting, switching to spectator, or disconnecting. It now blocks only sneak-key dismounts while the vehicle is moving.