Add color to multiversion make command

[cychitivav]

I used ANSI escape codes to add color to multiversion command:

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Now

[clalancette]

I will say that I am reluctant to do this. The main reason is that while this works on Linux terminals, hard-coding it here means that this is going to look weird on e.g. Windows. So while Windows is definitely not a primary development target for this, I don't really feel like this is important enough to break it.

[cychitivav]

I have added variables to prevent it from looking weird in the code. I understand that maybe it is not a major change, but I think it is something useful for new people who want to contribute to note that multiversion is also a make command. I say this because at first, I thought it was a continuation of the previous line.