npmjs has fixed/lowered the cache expiry time now

Ref: https://npm.community/t/scoped-packages-have-latest-version-disappear-temporarily-soon-after-publish/633/7

Renovate now ignores any upgrades that are marked as deprecated, unless the current version is itself also deprecated. The new config option `ignoreDeprecated` can be set to false to disable this if necessary.

Closes #1988

Raises a deprecation warning issue per-dependency. Uses logic that if latest version is deprecated then the package is deprecated.

Closes #1592

Adds logic to detect presence of “deprecated” field in latest version. First step towards #1592

This reverts commit b46a95a9.

This reverts commit 04e0ca1f.

Refactors credentials/token handling to rely less on env variables and instead use an endpoints middleware for credentials handling.

First step towards #2105

Renames "date" and "time" values from datasources to instead be "releaseTimestamp".

Adds a wrapper to all datasources to provide a generic purl-based interface.

Closes #1764