tmux statusline changes after over a year.

1. Moved most of the left statusline to the left.
2. Moved the window list to the center.
3. Moved
tmux statusline changes after over a year.

1. Moved most of the left statusline to the left.
2. Moved the window list to the center.
3. Added a mail indicator.
4. Simplified uptime script.
Added vim ftdetect and syntax file for applescript.