Closes #626

This feature adds explicit support for correctly generating the yarn.lock file for workspaces. Specifically, it means that the yarn.lock in the root directory is regenerated whenever *any* package.json is modified. Previously lock files were only every updated if its corresponding package.json changes, but that is not the way yarn workspaces works.

Closes #473

The ignoreNodeModules feature is replaced with a generic ignorePaths one and allows any array of strings to be defined and package.json file matching them will be skipped/ignored. Also migrates any existing config/presets.

This is a major refactor of branch code to prepare for Yarn workspaces plus creating PRs for branches with failing lockfiles. Marked as "feature" to cause a minor version bump due to the moderate chance of accidentally breaking something.

Fixes #732

* fix: explicitly check automerge = true

* update presets fixtures and tests

* fix versions tests

* update tests

- reuse suffix for any “before and after” splits
- move “on every weekday” massage to migrate

- Split ‘x and y’ schedule into [x, y]
- Replace schedules like ’on mondays’ with ‘on monday’

Eliminating one more possibility for #707

Leave the rest to error.

tmpDir is now created once per-repository and package.json files are written and lockfiles generated based on the repo's directory structure. This way node_modules can be reused between branches in same run.

Closes #501

This makes for an uglier migration and potentially some redundancy, but is the only easy way to ensure that the migrated behaviour is definitely correct.

Fixes #713

Refactored the `automerge` field to change it to boolean. Existing string will be migrated to new config. Automerging lock files is now possible by adding `”lockFileMaintenance”: { ”automerge”: true}` to config.

Closes #706

Add check for pr.canRebase. This will be false if the PR has been modified.

Fixes #790

Previously, preset resolution was being done last, after merges of renoate.json or package.json config. This caused wrong ordering of config in cases where both presets + regular config was in use. Instead, resolving of presets is now done at each stage before merging.

Fixes #708