Set the COLORTERM environment variable to 'truecolor' to advertise 24-bit color support

[krishnakumarg1984]

The title is hopefully descriptive enough.

An identical feature request for alacritty was implemented sometime ago:

A lot of other terminals (terminator, iTerm2, konsole, hyper, ...) set the COLORTERM environment variable to truecolor to indicate that the terminal supports it (see https://gist.github.com/XVilka/8346728 for more details).

It is not a really great solution (it can fail if you start a terminal from another terminal, for example), but apparently there is currently no other standard.

I would therefore propose that alacritty sets COLORTERM=truecolor in order for application developers to detect whether or not the terminal supports it.

See this commit which implements this for alacritty. Another example for qterminal is here.

Wezterm users have to currently hardcode this environment variable & value string in their config.lua file. See this example config in an issues filed in this repo. This shouldn't be necessary at all since Wezterm is capable of 24-bit colors, it should proudly advertise it (and leave it up to various programs to use or discard it).

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