add a switch to disable text colors and highlighting

suggest adding a switch to disable text colors. For some computers with lower performance, text highlighting or complex text colors can cause lag.

The issue does not name files, tests, or an entry point. Start by locating WindTerm's text-color and highlighting settings, then determine where a user-facing switch belongs and how the disabled state should affect rendering. Done means the switch prevents costly text colors or highlighting without affecting normal terminal use.

Written by the indexing model from the issue text.