Add emojis to permission prompts

[dsseng]

Reason: #1651. I think it looks much better now

[dsseng]

I'll add emojis to other output strings too, but not too many.

[dsseng]

@daynin fixed! Thanks for a good advice.

[ry]

Thanks -

Please use ⚠️... and no need to use a different one for each permission

It would be nice to make the text bold too... I think we could use
https://github.com/ogham/rust-ansi-term/blob/master/Cargo.toml
Or maybe it's easier just to write our own color module by porting this:
https://github.com/denoland/deno_std/blob/master/colors/mod.ts

[dsseng]

@ry I think each emoji should say what is required, not just ⚠️

[ry]

I disagree. The purpose of the emoji is just to distinguish an important message from other logging output - we should be consistent and minimal in applying these. This is not going to be one of these projects that splatters the screen with undiscerning graphics.

[dsseng]

@ry done! But after adding the ansi_term crate python tools/build.py stopped working, but cargo build didn't.

[ry]

@piscisaureus Please review for windows

[piscisaureus]

windows output visually looks like:

D:\deno>target\debug\deno.exe tools\format.ts
Compiling D:/deno/tools/format.ts
Compiling D:/deno/js/deps/https/deno.land/x/std/fs/path.ts
Compiling D:/deno/js/deps/https/deno.land/x/std/fs/path/mod.ts
Compiling D:/deno/js/deps/https/deno.land/x/std/fs/path/constants.ts
Compiling D:/deno/tools/util.ts
clang_format
�[1m�  Deno requests access to run a subprocess. Grant? [yN] �[0m

[dsseng]

@piscisaureus are you in PowerShell or cmd?

[piscisaureus]

@sh7dm cmd. But I don't think that matters.

[piscisaureus]

PS D:\deno> .\target\debug\deno .\tools\format.ts
clang_format
�[1m�  Deno requests access to run a subprocess. Grant? [yN] �[0m

[ry]

revert the last commit to make it work on windows....

Use #[cfg(windows)] above the line.

[ry]

@piscisaureus please try again

[ry]

LGTM - nice work!