feat: show repo migration (go-ipfs 0.12.0)

[hacdias]

Closes #1940 and closes #1823 + uses go-ipfs 0.12

[hacdias]

I will try to include #1823 in this PR too.

[hacdias]

@lidel can you please take a look? it should be ready

[lidel]

Added small fix that shows the migration window again after it is finished (so user who clicked "run in background" gets feedback when migration is finished and the IPFS node is running again):

[lidel]

Thank you @hacdias!

Did some testing with 0.11 → 0.12 and UX should be more than enough for users with big repos.
Merging, as we want to ship ipfs-desktop with 0.12 this week.

[gRoussac]

Hi, just passing by to describe an issue I just had.

I installed the latest binary proposed go-ipfs_v0.11.0_linux-amd64.tar.gz and then wanted to have a look at the desktop version with ipfs-desktop-0.20.1-linux-amd64.deb which apparently installs v.0.12.

Then trying to run daemon again I got Your programs version (11) is lower than your repos (12)

Readme says go get -u github.com/ipfs/fs-repo-migrations but this failed with

package github.com/ipfs/fs-repo-migrations: no Go files in /home/greg/go/src/github.com/ipfs/fs-repo-migrations
I guess there is a path issue somewhere.

So I bascially deleted my config file and ipfs init again tu run go-ipfs version: 0.11.0 again.

Thanks

[hacdias]

Hi @gRoussac! IPFS Desktop upgraded your repository to a newer version. You now need to update the binary you are using to run IPFS from 0.11 to 0.12.

I created a PR to update the docs to the newer version: ipfs/ipfs-docs#1074

[gRoussac]

Thanks!