VCS file-status colors

[sum01]

1. Add an option like filemanager-vcscolors
2. Test the dir on-scan if it has VCS
3. If VCS found, check the dir's "status" (i.e. git status)
4. Add zero-width Unicode characters to the dirmsg property of the file, based on it's tracked/untracked/ignored/etc. status
5. Add pattern-matching to the zero-width chars into syntax.yaml to colorize each file/dir based on status.

I'd like some input as to which of Micro's syntax types should be used for tracked/untracked/ignored/etc. so feel free to recommend them.

Having ignored files be "comments" is pretty obvious, but everything else is kind of up in the air.

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Note that an onSave hook will need to be added, which will trigger a re-scan of VCS status on the file, and a change of the dirmsg, where appropriate. This will allow the colors to adjust as you work on files.

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On second thought, instead of re-coloring files we could put little ascii indicators for the git status (or even combine indicator & color?). Maybe both could be made optional as well.