This commit completely removes the iostreams.NewColorScheme() initializer function in favor of exporting the type fields for greater clarity in its use.
The result being code specifying only the fields that matter to test cases.
This commit implements the actual changes around configuration setting / environment variable logic for displaying labels using their RGB hex color code in terminals with truecolor support.
One of the subtler changes in this commit is renaming generic ColorScheme.HexToRGB logic to render truecolor to ColorScheme.Label as this feature was being used exclusively for labels. This is due to confusion about introducing the new `color_labels` config on top of generic coloring logic.
Allow the accessible markdownEditor prompt to be blank when the blank
comes from the result of an interactive session with an editor, even when
blankAllowed is false.
This behavior aligns the accessible prompter with the behavior of the
current standard prompter.
This commit refactors the color format around table headers to ensure the GitHub CLI uses thematically appropriate colors based on dark background, light background, or no color at all.
In order to do so, `ColorScheme` needs information from the terminal about the background appearance (dark, light, none) to determine appropriate muted color.
During discussion in cli/cli#9934, we can to the conclusion that the logic around checking for core GitHub CLI updates would diverge from GitHub CLI
extension updates over time. To that end, this commit splits that logic into a separate function with a new environment variable.
This commit expands the in-line docs around updaterEnabled package variable used to affect release checking.
Along with clarifying specific details discovered when talking with @williammartin, I'm also removing a useless local variable.
