v2.0.0-RC6-19

• Keep colors when printing trees in more cases by default (keep them on CIs, and when the output of coursier is piped)
• Ensure cs list doesn't crash if the app directory doesn't exist
• Fix an issue in the way execve works (should make launch with explicit JVMs, like cs launch ammonite --jvm 11, work)
• Fix some wrong conflicts being sometimes reported