Bumped target SDK rev to 0.3.4.0
Creating a local copy of html_enhanced_config

...until version in SDK is fixed
bot_io: added AnsiColor.LIGHT_RED
hop: added warning output, with AnsiColor 'light red'

Made `log` method public, too
TaskContext: introduced getSubLogger

new class: TaskLogger
hop_tasks: using sub logger in dart_analyzer task
hop_runner: only give docs generator dart files