Add missing libgtk2 package and fix Xming config

[paulgaumer]

1. Installing libgtk2.0 is necessary because it’s not installed by default with the WSL version of Ubuntu. Without this package, trying to launch Sublime Text would raise errors

2. The echo "export DISPLAY=:0" >> ~/.zshrc was originally called before installing zsh. Trying to launch Sublime Text wouldn't do anything. Moved the command to the end of the zsh setup

[ssaunier]

Thanks @paulgaumer! I can't merge it as is because of the way the repo works

Thanks!

[mdik]

I have the feeling that the export DISPLAY line gets lost during oh-my-zsh install, so I would move it further back.

[mdik]

I don't see libgtk2.0 but only libgtk2.0-0 as package?

[paulgaumer]

I don't see libgtk2.0 but only libgtk2.0-0 as package?

libgtk2.0 worked when I ran it, but libgtk2.0-0 was indeed referenced in other articles and might be more accurate

[barangerbenjamin]

Fix #72 and #71

[ssaunier]

@barangerbenjamin can you update the source files so that when we compile with build.rb we don't override those changes (I can't merge as is).

Thanks.

[db0sch]

This PR has been replaced by this one #90 as i couldn't access the @paulgaumer 's branch.
Thank you all 🙏