move tmux config into tmux subdirectory

tmux/plugins/tpm/scripts/helpers/tmux_echo_functions.sh

@@ -0,0 +1,28 @@
+_has_emacs_mode_keys() {
+	$(tmux show -gw mode-keys | grep -q emacs)
+}
+
+tmux_echo() {
+	local message="$1"
+	tmux run-shell "echo '$message'"
+}
+
+echo_ok() {
+	tmux_echo "$*"
+}
+
+echo_err() {
+	tmux_echo "$*"
+}
+
+end_message() {
+	if _has_emacs_mode_keys; then
+		local continue_key="ESCAPE"
+	else
+		local continue_key="ENTER"
+	fi
+	tmux_echo ""
+	tmux_echo "TMUX environment reloaded."
+	tmux_echo ""
+	tmux_echo "Done, press $continue_key to continue."
+}