Problem: Pulling in upstream PRs requires command-line

[weex]

In the process of syncing up a C4 fork, eligible PRs from upstream are to be copied and merged, but this is not possible to do without using command-line git or c4pr.sh script. This is important because, the act of merging a PR doesn't require much more than a) reading if it addresses a valid problem and b) checking that CI passes. Both of the above could be done on mobile if no command-line were necessary.