Move logback db package to external jar

ch.qos.logback.core.db and ch.qos.logback.classic.db are moved to an
external jar.
Remove Jansi from ConsoleAppender

Jansi is not applicable for Android
Remove unused functions in EnvUtil
Deprecate ConsoleAppender and colors

The ConsoleAppender is deprecated for LogcatAppender. Consequently, all
color conversion words are also deprecated and will be removed with
ConsoleAppender in a future release.