added isSkill condition authored by Lxlp's avatar Lxlp
## Description
Checks if the given skill is in cooldown for the target entity
## Attributes
| Attribute | Aliases | Description | Default |
|-----------|-----------|----------------------------------------------------------------------|---------|
| skill | s | The metaskill to check | |
## Examples
```yaml
TargetConditions:
- skillOnCooldown{skill=TestSkill}
```
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