* use tmux 3+ config by default
* fix default EDITOR set to vim
* remove unnecessary PATH definition (previously used for correct environment for proxmox pct enter command)
* automatic attach tmux for all cases include existing $TMUX variable, but only if contains double slash in the contain path (that is signal about parent TMUX session - may be unstable solution)
* reassign PATH variable in shell-env bashrc include script for resolve incorrect value of that if use pct enter command in proxmox
* information marker about turned off modifier key of nested session
