switch terminal based on tabs

• setup
• toggle term
  • create if non exist
  • change to
• quit term when tabclose
• fold term prompt
• term num in status line(openterm('nu', {name = ...}))
• change to insert mode when enter term and cursor at last line term get actual line (vim.fn.line('$') get buffer line)
• default 1 term each tab (count arg for multiple)
• possession integration
• stdout > output to buffer
• for paste
• nushell
  • send '\n'
  • auto tcd
    • pin tabname manually
    • smart tcd (HookPwdChanged: is git or not under git)
  • open file in cli
    • open file not in cwd
  • opposite pwd
• default [No Name] buffer -> terminal (possession.lua)