Correctly process single-threaded compilations

[MetanoKid]

To tell single-threaded compilations from multi-threaded compilations (those that have /MP enabled) we're parsing messages until we find these texts:

• Generating Code...
• Compiling...

MSBuild seems to use the language of the context that executed the tool: either Visual Studio's or system language (when executed via .exe).

Proposed solutions

• Ensure tool forces MSBuild to use some english encoding (i.e. en-US). If it's not installed in the system, we can't do anything. Check Compilation.cs, Start method: it should be using that encoding?
• Build a database of these messages per language and use it to detect which language it's using. Useful when other parsing happens (if any).
• Find another heuristic (i.e. if we see blocks of front-end followed by blocks of back-end in reverse order).

This is the wrong result:

This is the expected result:

Reproduction steps

• Execute tool via .exe file in a system whose language isn't english.
• Load C++ solution.
• Tick /Bt+ option and set 1 for the Max parallel CL per project option.
• When the build is finished, convert it into a trace with File > Create timeline from events file...