Feature request: Open pull request links with "Ignore whitespace" option enabled by default

[reyronald]

As a user of the extension, I want that every time I click in a pull request in the pull request list page "https://bitbucket.org/{team}/{repo}/pull-requests/", the PR opens with "Ignore white space" option enabled by default, so that I don't have to manually enable it each time I am reviewing code.

I should be able to opt-in / opt-out of the feature in the Options page, in case I'd like to disable this functionality.

This is as simple as appending ?w=1 to every PR URL in the list page, nothing else. If I am currently inside a PR with the Ignore white space off, I don't want it to be automatically changed, because otherwise I wouldn't be able to review code in this mode if I wanted to unless I disable the feature in the extension.