Grammar::Tracer::Compact

Based on Jonathan's Grammar::Tracer which can be found at https://github.com/jnthn/grammar-debugger.

The only difference is how the how the trace looks like:

• removed the glyphs
• removed the colored background
• color the Grammar element depending on the match succes or failure
• Inline the matched string with the Grammar element on success
• make the output almost half the vertical size