Adds platform support for Bitbucket cloud.

Closes #136, Closes #2238

Follow up to #2434, this lets Renovate actually update those image lines

Renovate did not recognize images where "image" was the first key in the YAML mapping inside the YAMl container list/array

Previously if grouping, all major/minor updates within that group were combined into one. Instead, we now honour the “separateMajorMinor”, "separateMinorPatch", and "separateMultipleMajor" settings and keep the groups separate if necessary.

For maximum compatibility with existing PRs, we name branches like `renovate/group-name` whenever possible and only name them like `renovate/major-group-name` or `renovate/patch-group-name` if major or patch are found.

Closes #2425

Methods to support performing Git operation using filesystem instead of web API. GitHub only and experimental only. Usage: define env variable `RENOVATE_GIT_FS`.

Closes #1925

fix: update dependency gh-got to v7.1.0

Renovate will now attempt to decrypt with existing default padding, and if that fails then try with RSA_PKCS1_PADDING.

Sets Cache-Control to ‘no-cache’ to instruct the http layer to always revalidate cached responses with the registry. Otherwise we can be up to 5 minutes “behind” because npmjs default cache time is 300s.

The authorization header can interfere with caching because npmjs doesn’t return “public” in the “Cache-Control” header.

npmjs has fixed/lowered the cache expiry time now

Closes #2363