Change bold color or persistenly set --color off

The default "bold" display is dark blue. This contrast is hard to read against dark/black background colors as is default in most operating systems. This is even worse for visually impaired people.

The only known workaround is to disable color by specifying the "--color off" option. This however is tedious to retype for every command. It would be safe to assume users would not decide on this on a command-by-command basis and would prefer persistent or at a minimum per session decision on this.

Any, or all, of the following options should help alleviate the issue:

1) provide environment variable to specify "--color off"
2) provide .aws config file option to specify default --color option
3) provide method to set custom colors for text/bold text
4) change the default color to something other than the current dark blue.