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Tim Hagemann
667dfec904
This adds basic support for meta-annotations for commands and
parameters and allows users to create their own custom annotations
combining certain existing annotations and values. For example, a user
can now define their own `CustomAnnotation` which combines a
condition and a flag:
```java
@Conditions("conditionname:confitionconfig")
@Flags("flagconfig=flagvalue")
public @interface CustomAnnotation {}
```
(Necessary `@Retention` and `@Target` ignore for brevity)
And use it just like they would normally.
This works by recursively going through the annotations, instead of
just looking at the root level. The reason most existing annotations
had to be touched is for them to be allowed on other annotations as
most of them were restricted to method or fields.
Currently there's no limit on nesting because if the user wants to
nest it to obscure levels - so be it. We could decide to limit this at
some point to prevent users from shooting themselves in the foot if
that's necessary.
`@Dependency` and was specifically ignored as I don't think it makes
sense for that to be supported in this use case.
Relates to: #89