[MSBuild Server] Forward console output to CLI

[rokonec]

Console output of MSBuild Server has to be redirected to calling CLI.
As opposed to child process, where such redirection is done by OS, handling of non-child processes outputs has to be coded.

Work breakdown:

• define message for console output containing text, foreground and background color
• capture console output in MSBuild Server (text, foreground and background color)
• send captured output by named pipe for each line, accumulated text > 200 characters or when console colors changes.
• receive message in CLI and print it to console.

[rokonec]

Works as a breeze - even with console coloring :-)

Implemented and parked into https://github.com/dotnet/msbuild/tree/feature/msbuild-server-v2--parked

Work left:

• unit tests
• refactoring and cleaning