Introduces shadowcaster support by adding shadow map index fields to light data, updating PlayerPositionsToShader and LightdataStorage to handle shadow map indices, and extending the shader and its includes to sample shadowcaster planes. Adds ShadowcasterUpdater script and editor preview for updating world-to-local matrices, and updates relevant arrays and property handling throughout the codebase. Also adds a sample plane mesh for shadowcasting.
Updated all relevant shader files and C# script to use Udon-prefixed light and player variables (e.g., _Udon_LightPositions, _Udon_LightColors, _Udon_PlayerCount) for consistency and to avoid naming conflicts. This change affects variable declarations, macro definitions, and all usages in BlendinShader, LitParticles, Water shaders, and included HLSL files.
Introduced a new WaterParticle shader for rendering water particles with alpha blending. Made minor formatting and calculation adjustments in Water.shader and DefaultSetup.hlsl, and updated Variables.hlsl. Added corresponding .meta files for new shader assets.
Replaces direct variable declarations and code blocks related to 'MoonsLight' with a new 'MoonlightGlobalVariables' macro included from Variables.hlsl. Adds OutLoopSetup macro for loop setup, updates all relevant shaders to use the new macros, and renames comments and identifiers from 'MoonsLight' to 'Moonlight' for consistency. Removes the obsolete MoonsLight.cingc include and its meta file.
