sysutils/tmux-xpanes: new port

Ultimate terminal divider powered by tmux

Features:

• Split tmux window into multiple panes
  • Construct command lines & execute them on the panes
• Runnable from outside of tmux session
• Runnable from inside of tmux session
• Record operation log
• Flexible layout arrangement for panes
  • Select layout presets
  • Set columns or rows as you like
• Display pane title on each pane
• Generate command lines from standard input (Pipe mode)

WWW: https://github.com/greymd/tmux-xpanes

Maintainer becomes submitter. Already submitter of other ports.

PR: 269102
Approved by: flo (mentor)
Differential Revision: https://reviews.freebsd.org/D38780