added isSkill condition authored by Lxlp's avatar Lxlp
## Description
Checks a global scoreboard value (the value associated with the fake player __GLOBAL__)
## Attributes
| Attribute | Aliases | Description | Default |
|-----------|-----------|----------------------------------------------------------------------|---------|
| objective | obj, o | The objective | |
| value | val, v | The value to match | |
## Examples
```yaml
Conditions:
- globalscore{o=KillCount;value=5} true
```
## Aliases
- [x] scoreglobal
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