added isSkill condition authored by Lxlp's avatar Lxlp
## Description
Tests if the item entity is similar to an itemstack
## Attributes
| Attribute | Aliases | Description | Default |
|-----------|-----------|----------------------------------------------------------------------|---------|
| item | i, material, m, mm, mythicitem | The item to check against | DIRT<!--type:Item-->|
## Examples
```yaml
TargetConditions:
- entityitemissimilar{i=MyCustomItem} true
```
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