added isSkill condition authored by Lxlp's avatar Lxlp
## Description
This condition tests how far above the ground the target entity is.
## Attributes
| Attribute | Aliases | Description | Default |
| --------- | ------------- | ------------------------------------------------------- | ------- |
| height | altitude, a, h | The height range to check | |
| maxHeight | mH | Limits the maximum height this condition can checks for | 30 |
## Examples
```yaml
Conditions:
- altitude{h=3-5} true
```
## Aliases
- [x] heightfromsurface
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