This commit was created by a combination of scripts and tools:
- an ast-grep script to prefix things in meta with `lib.`,
- a modified nixf-diagnose / nixf combination to remove unused `with
lib;`, and
- regular nixfmt.

Co-authored-by: Wolfgang Walther <walther@technowledgy.de>

**This commit should cause no rebuilds.**

# Moving Java overrides out of all-packages

All usages of this pattern have been moved to
'let ... in' blocks.

Patterns I searched for:
* `jdk =`
* `jdk_headless =`
* `jre =`
* `jfx =`

The `jing` alias has been moved to aliases.nix, so
update the usage of `jing` in `xmloscopy` to
`jing-trang`.

cassandra was ignored because that derivation
involves code generation.

I ignored grails, because jdk is set to null by
default by an override in all-packages.nix. That
package would need a slightly larger refactor to
deal with.

Packages with a *-native variant were ignored because
those would need to be refactored.

jetbrains was ignored because that might be a special case?

I ignored virtualbox, because I did not want
to touch the usages of the pattern for other
dependencies.

Some projects that expect to be built on debian/ubuntu
search for saxon-xslt instead of saxon.

Upstream builds with Gradle now, so yay, we can use normal tooling.
Also no more JDK8.