Temporary replacement for removed `crystal tool format --format json`

[asterite]

Fixes #63 Fixes #64

The --format json was removed (I have no idea why). This is a temporary replacement:

• we obviously don't pass the --format json option anymore
• we try to parse the text output to get the line number and error

[asterite]

This is better than #64 because it keeps showing errors when they happen.

[vladfaust]

Works for me, thanks, @asterite. As of it's being temporary, should we merge this or even release the new version?

It contains commented code which is ideally should not go into a release version, but we're having a 0.x version here... :thinking:

Update: I'm using the plugin directly from the git folder, not PackageControl for now, that's why I'm asking

[asterite]

This should be merged and a new release done. This will always work and it's almost as good as the version that used --format json.

[asterite]

Thank you Vlad!

[faustinoaq]

Tested and working, Thank you @asterite and @vladfaust :+1: