Windows 10 Virtual Terminal Sequence Support about termcolor

[ikalnytskyi]

@slurps-mad-rips thanks for reaching out to me. It's definitely in my TODO, and now I know at least someone would like to have this.

The main challenge right now for me is:

• Let termcolor to call SetConsoleMode(ENABLE_VIRTUAL_TERMINAL_PROCESSING) on Windows 10 and use ANSI escape sequences.

• Let users to do the call instead and check whether ENABLE_VIRTUAL_TERMINAL_PROCESSING enabled or not when colored manipulators are used. This I like more in a sense we don't introduce side effect but it would require to introduce additional runtime cost.

• Use some #define TERMCOLOR_WINDOWS10_ASCII to unconditionally use ASCII sequences if defined.

• Come up with another idea that will not require additional runtime cost, or will provide a way to do not pay for runtime checks.

I'll think about it and will come up with some solution for sure. :)