Implement TO_VOLUME trigger support for controlling volume enabled state

[Copilot]

Checklist

• I have added a changelog entry to the CHANGELOG.md file on the branch/fork (if it is an internal change, this is not needed).
• This pull request meets the Coding Conventions standards: https://github.com/MontyTRC89/TombEngine/blob/master/CONTRIBUTING.md#coding-conventions

Links to issue(s) this pull request concerns (if applicable)

N/A

Pull request description

Adds engine support for TO_VOLUME trigger type already present in compiled levels. Enables dynamic control of volume enabled state via triggers and anti-triggers.

Changes

• trigger.h: Added TO_VOLUME to TRIGOBJECTS_TYPES enum
• trigger.cpp: Implemented TO_VOLUME handler in TestTriggers()
  • Locates target volume via global index across all rooms
  • Sets Enabled = true on trigger activation
  • Sets Enabled = false on anti-trigger (ANTIPAD/ANTITRIGGER/HEAVYANTITRIGGER)

Implementation

Volume lookup uses sequential iteration through g_Level.Rooms[].TriggerVolumes to resolve global index to specific volume instance. Follows existing pattern of trigger value as direct index (cf. TO_OBJECT, TO_CAMERA).

case TO_VOLUME:
    // Find volume by global index
    int globalIndex = 0;
    for (auto& room : g_Level.Rooms) {
        for (auto& volume : room.TriggerVolumes) {
            if (globalIndex == value) {
                targetVolume->Enabled = (triggerType != ANTIPAD && 
                                        triggerType != ANTITRIGGER && 
                                        triggerType != HEAVYANTITRIGGER);
                break;
            }
            globalIndex++;
        }
    }

Original prompt

I have added a new TRIGOBJECTS_TYPES for volumes. Update the trigger code so that when triggered the TriggerVolume enabled field becomes true and when anti triggered it becomes false

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