Using openrs2-nonfree 377 branch as reference, renamed all obfuscated
fields and methods in the rendering pipeline before converting to Kotlin:

- Rasterizer3D: reciprocal16 (was anIntArray1469), removed dead code
- Model: 19 field renames (depth buckets, priority sorting, clipping
buffers, lighting info), 4 method renames (renderTriangles,
drawTriangle, drawClippedTriangle, isPointInTriangle)
- Scene: 19 field renames (tile render cycle, viewport bounds, wall
flags, occlusion, culling), plus InteractiveObject.renderPriority
and GroundItemTile.heightOffset
- Animation: transformCount (was anInt433)
- Fix stopMidi NPE on logout when MIDI sequencer not initialized

All three files converted with correct Kotlin bitwise precedence,
compound assignment splits, and @JvmStatic/@JvmField for Java interop.

Convert scene/tile, renderable, and media data holders to Kotlin (Phase 4)

See merge request high-level-alchemy/client!4

17 files: VertexNormal, ModelHeader, Renderable, Item, Projectile,
GameObject, GameAnimableObject, SceneCluster, SpawnObjectNode,
GroundItemTile, InteractiveObject, Wall, WallDecoration,
FloorDecoration, GenericTile, ComplexTile, SceneTile.

GameObject.id renamed to objectId to resolve Node.id shadowing
(same pattern as OnDemandNode.id → fileId from Phase 2).

Rewrite BZip2 decompressor in Kotlin (Phase 3)

See merge request high-level-alchemy/client!3

Convert cache/def/ to Kotlin (Phase 3)

See merge request high-level-alchemy/client!2

Add Kotlin Gradle plugin (migration Phase 1)

Closes #1

See merge request high-level-alchemy/client!1

Bunch of fixes

Refactoring some variables and changing naming from interfaces to widgets.

Sound volume fix + null checks + jaggrab check fix