Add script event handler safety checks to prevent invalid usage

[GregHib]

Prevents nesting handlers e.g.

playerSpawn {
    playerDespawn {
    }
}

[github-actions]

Qodana for JVM

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
☁️ View the detailed Qodana report

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[codecov]

Codecov Report

❌ Patch coverage is 90.83969% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.61%. Comparing base (f72767b) to head (de7523a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...s/engine/entity/character/mode/combat/CombatApi.kt	83.33%	3 Missing ⚠️
...tlin/world/gregs/voidps/engine/inv/InventoryApi.kt	57.14%	3 Missing ⚠️
...rc/main/kotlin/world/gregs/voidps/engine/Script.kt	33.33%	1 Missing and 1 partial ⚠️
...orld/gregs/voidps/engine/client/ui/InterfaceApi.kt	91.66%	1 Missing ⚠️
...n/world/gregs/voidps/engine/entity/Approachable.kt	93.75%	1 Missing ⚠️
...kotlin/world/gregs/voidps/engine/entity/Despawn.kt	83.33%	1 Missing ⚠️
...tlin/world/gregs/voidps/engine/entity/Operation.kt	93.75%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...regs/voidps/engine/client/ui/dialogue/Dialogues.kt	47.61% <100.00%> (+5.51%)	⬆️
...gregs/voidps/engine/client/variable/VariableApi.kt	91.89% <100.00%> (+0.98%)	⬆️
...n/world/gregs/voidps/engine/data/SettingsReload.kt	85.71% <100.00%> (+2.38%)	⬆️
...n/kotlin/world/gregs/voidps/engine/entity/Spawn.kt	81.81% <100.00%> (+2.33%)	⬆️
...orld/gregs/voidps/engine/entity/character/Death.kt	90.90% <100.00%> (+0.90%)	⬆️
.../voidps/engine/entity/character/mode/move/Moved.kt	88.57% <100.00%> (+1.47%)	⬆️
...gs/voidps/engine/entity/character/npc/hunt/Hunt.kt	85.18% <100.00%> (+2.57%)	⬆️
.../voidps/engine/entity/character/player/Teleport.kt	48.07% <100.00%> (+4.32%)	⬆️
...dps/engine/entity/character/player/skill/Skills.kt	92.50% <100.00%> (+1.07%)	⬆️
...main/kotlin/world/gregs/voidps/engine/inv/Items.kt	84.52% <100.00%> (+2.33%)	⬆️
... and 9 more

@@             Coverage Diff              @@
##               main     #909      +/-   ##
============================================
+ Coverage     38.50%   38.61%   +0.11%     
  Complexity     7679     7679              
============================================
  Files          1560     1560              
  Lines         61808    61939     +131     
  Branches      15688    15691       +3     
============================================
+ Hits          23798    23917     +119     
- Misses        32703    32714      +11     
- Partials       5307     5308       +1     

Components	Coverage Δ
Content	36.27% <100.00%> (+<0.01%)	⬆️
Engine	45.39% <90.69%> (+0.55%)	⬆️
Network	60.85% <ø> (ø)

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