Add "shadows" enumeration field to effects-settings in VEML. xsd and update for schema version 3.1

[dyfios]

Is your feature request related to a problem? Please describe.
Current VEML schema does not allow standardized global shadow settings in effects-settings. We need better control over light shadow behavior for the world.

Describe the solution you'd like

• Add an enumeration field shadows to effects-settings in @Five-Squared-Interactive/VEML/files/VEML. xsd, supporting the values: "off", "on", and "preserve".
• Update schema version to 3.1.
• Update all relevant Languages files to reflect the new field and schema.
• In the WebVerse-Runtime codebase, add a new V3_1 directory for the updated schema under Assets/Runtime/Handlers/VEMLHandler/Schema/.
• Update VEMLHandler (likely Assets/Runtime/Handlers/VEMLHandler/Scripts/VEMLHandler.cs) to:
  • Support the new shadows field in effects-settings.
  • If shadows is off, disable shadows for all lights in the world.
  • If shadows is on, enable soft shadows for all lights in the world.
  • If shadows is preserve, leave shadow settings for lights unchanged.
• Integrate VEML schema version 3.1 with WebVerse Runtime effects/environment parsing.

Describe alternatives you've considered

• Set shadows per light rather than globally (more complex, less standardized)
• Ignore schema updates and set shadows via runtime configuration only

Additional context

• See prior handling of effects-settings and version updates in Assets/Runtime/Handlers/VEMLHandler/Schema/V3.0/VEML.cs and similar versioned files.
• VEMLHandler processes effects using ProcessEffects (see VEMLHandler.cs), consider how litefog is processed for reference when extending to shadows.
• Remember to update conversion and utilities as needed.
• See also VEMLUtilities.cs and how schema upgrades/migration are handled.
• Updates may need to be made to @Five-Squared-Interactive/StraightFour to facilitate this.

Impact

• This enables worlds to define global shadow policies and improves scene visual consistency.

[dyfios]

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