Co-authored-by: Jamie Magee <jamie.magee@gmail.com>

* fix(package-rules): add groupSlug to matched package rule if necessary

* Update lib/util/package-rules.spec.ts

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

Co-Authored-By: Michael Kriese <michael.kriese@visualon.de>

Co-authored-by: Rhys Arkins <rhys@arkins.net>
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

1. All languages are moved to constants/languages.ts
2. Updated all the references

Needed for package managers that support more than one depType (e.g. Bundler).

Closes #3076

Adds new filter option “languages” to packageRules to filter on language time.

Adds new filter option `managers` to `packageRules`. This allows you to define rules that filter on package manager (e.g. pipenv) before applying the rule.

Adds filtering option “sourceUrlPrefixes” to allow matching updates based on one or more prefixes. Prefixes could be a full source repo, e.g. https://github.com/renovatebot/presets, or it could be an org prefix like https://github.com/renovatebot/

This will make monorepo groupings easier.

Adds an `updateTypes` field to `packageRules` that lets you specify rules based on update types such as major, minor, patch, pin, etc.

Renames currentVersion to currentValue, newVersion to newValue, newVersionMajor to newMajor, and newVersionMinor to newMinor.