zshrc - Show '^C' when Ctrl-c is pressed

similar to Bash

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>
zshrc - add comment on current vi-for(back)word-word not working in tmux

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>
zshrc - add control sequences for alt-left(right)arrow in tmux

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>