Add autocolor for signs

1 job for master in 2 minutes and 2 seconds
Name Stage Failure
package_mcplugins Package
# Compiler replay data is saved as:
# /builds/linus/mcplugins/replay_pid21.log
# If you would like to submit a bug report, please include
# instructions on how to reproduce the bug and visit:
/bin/bash: line 97: 21 Aborted (core dumped) mvn clean package
ERROR: Job failed: exit code 1