Obsolete comment
GROOVY-6752 groovysh: restructure Main.groovy: Do not install AnsiConsole in static initializer
Allow subclassing
GROOVY-6754: groovysh: do not terminate after evaluating startup arguments
GROOVY-6754: groovysh: startup arg -e and positional consistent with groovy
GROOVY-6754: groovysh: Handle bad user input for options
Merge pull request #405 from tkruse/groovysh_main

GROOVY-6752+6754 groovysh: restructure Main.groovy