Implement config option for term colors 16..256
This adds a config option which allows setting terminal colors above the 0..16 range. Live config reload already works for this, so it is possible to change these colors the same way it works with the normal colors. If a color below 16 is specified, the configuration will throw an error, so the normal colors can't be overridden. This is just to prevent possible complications with the settings that already exist.
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