[SUGGESTION] Make the basic colors conditional on the vim colorscheme/terminal palette

[iddinev]

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The plugin works great, but the hardcoded color values means that for terminal vim and some colorschemes / terminal palettes the colors might not work, which leaves the user having to recreate part of (or all of) the configs in the plugin with new color values, which kinda defeats the purpose of the plugin. It would be a good idea, if possible of course, for the basic colors to be dependent on the colorscheme or terminal palette in such situations.