perf(items): render item icons from a GPU atlas

[saadndm]

Improvements

• Added animated item icon support in HUD and Compose
• Perf tested on Evergreen inventory hud, reduces incremental rendering cost by 91%, (0.343ms -> 0.030ms per frame)
• Added public PolyItemIcon API taking in a Minecraft Item, ItemStack or registry ID string
• Initializes item data components if not loaded yet, icons can now render before first world join
• Separates atlases by resolution so icons remain sharp after resizing or changing HUD scale
• Fixed unaligned item picker dropdown
• Recovers item atlases after resource reloads and window resizing

Impl Details

• Uses GPU atlases for item icons, and related rendering optimizations, originally implemented by @anolithme
• Improved atlas scheduling so the item picker renders icons immediately without visible loading state
• The ItemStack overload renders vanilla-style count, durability, and cooldown decorations
• Unified gameplay, editor, pre-world, and fallback HUD preparation so the rendering paths no longer drift
• Rerenders icons when their Minecraft model state changes, static icons remain cached
• Added render-target and scissor handling needed to render vanilla item models directly into atlas slots
• Updates VulkanMod 1.21.1 to latest version fixing a crash, tested for compatibility on VulkanMod/Vulkan versions

Tested on all versions

Supersedes #982

Related Issue(s)

Closes #953
Closes #937

[saadndm]

Changes I made:

fix stuff & perf(items): rerender animated icons only on TickEvent:

• Animated textures only advance per tick and glint offset moves sub-pixel per tick, so animated icons rerender once per tick instead of every frame

fix(items): mark icons available on server join:

• Minor fix in case the pre-world component initialization failed

fix(items): request exact item render sizes:

• Reverted the round up to 8 change because it made icons pixelated
• Tested with a full inventory HUD dragged at max size, only cost ~0.3ms/frame on 26.2 while dragging

fix(items): register picker icons before render:

• Registers picker icons in onPlaced again, and runs recomposition and layout before the atlas renders so icons revealed by pointer drag, smooth wheel scrolling, or a search all draw on the same frame

fix(hud): rebind main target after offscreen target changes:

• Fixes all HUDs flickering for a frame whenever an atlas page was created/disposed, because creating or destroying a render target leaves framebuffer 0 bound on 1.21.1, where GUI draws don't rebind
• Fixes preexisting bug where HUDs vanished during window resize in 1.21.1:

before.mp4

fix(skia): isolate Skia calls made outside a draw from Minecraft's GL state:

• Fixes block icons rendering without depth test/cull on their first render in 1.21.1, 1.21.4, 1.21.5 like this:

• Skia applies resetGLAll lazily on its next GL call. Since Complete Performance Overhaul #1036 some warm up frames open a GL window without making any Skia call, so the reset fired too late, outside any window, and left GlStateManager's cache stale
• Also moves the framebuffer binding into StoredGLState instead of saving it by hand in every draw path