Use subtree of webui library instead of submodule

[bminer]

Per #55, this PR attempts to replace submodules with subtree so that go get only needs to be performed on the Go module without any symlinks needed to the webui C/C++ library.

See https://www.atlassian.com/git/tutorials/git-subtree for a nice tutorial.

I think perhaps we can add more commits to this PR to remove the unneeded sync-webui program, etc.

Would love to get some feedback on this. I'll try it out to see if it works!

Basically just did the following:

git rm v2/webui
git commit
git subtree add --prefix v2/webui https://github.com/webui-dev/webui.git 94a8cfbad041f44c576c62d9723cc0efa846330a --squash

[AlbertShown]

I did a more complete changes in this branch https://github.com/webui-dev/go-webui/tree/subtree , I already tested it and looks fine to me.

Please let me know if I miss something, or if this PR is more complete than the branch.

[bminer]

Closing for now. I will try out the new go-webui version here shortly!

[bminer]

Yeah, to be clear, I think your subtree branch is a more complete set of commits, so closing this PR in favor of yours. How do you like this approach so far? Does go get work out of the box now?

[AlbertShown]

Yes, it does work easier than before, thank you for the proposition @bminer