[4.6] Slashes in file path used in Src and Downloads API classes are url-encoded

[zolhorvath]

Slashes in file path used in Src and Downloads API classes are url-encoded, which makes it impossible to get metadata or get the content of files from a repository unless the file is in the project root.

For example, in case of \Bitbucket\Api\Repositories\Workspaces\Src::download(), if I want to download a file from my project's subfolder:

$this->client->repositories()
    ->workspaces('my-workspace')
    ->src('my-project')
    ->download('main', 'docs/foo/BAR.md');

...then I expect that the client fetches the data from the URI string https://api.bitbucket.org/2.0/repositories/my-workspace/my-project/src/main/docs/foo/BAR.md,

but the URI string will be https://api.bitbucket.org/2.0/repositories/my-workspace/my-project/src/main/docs%2Ffoo%2FBAR.md, which will obviously fail to return the file's content (and throws an API error instead).

Methods affected:

• \Bitbucket\Api\Repositories\Workspaces\Src::show()
• \Bitbucket\Api\Repositories\Workspaces\Src::download()
• \Bitbucket\Api\Repositories\Workspaces\Downloads::download()
• \Bitbucket\Api\Repositories\Workspaces\Downloads::remove()

Added a new test which hopefully describes my issue more clearly.

Asking for a review, and last but not least, thank you for this Bitbucket Client!

[GrahamCampbell]

Thanks for the report. It's a shame some Bitbucket APIs expect the slashes to be encoded, and some not. I don't have time to check this, but I trust you've confirmed your changes to work for these APIs, so I'm happy to merge on that basis.