1. Adjust the space between icon and text in "session" segment.
2. Add the background color of upstream gone in "git" segment.
3. Add upstream hyperlink and adjust the space between icon and text in "git" segment.
1. Show the root/admin icon and the current folder name in console title
2. Update the background color of behind status in git segment
3. Update the git_icon, branch_identical_icon and branch_gone_icon in git segment