Color console outputs for ROS2 in grc

conf.ros2

# Message after [WARN]
regexp=\[WARN\](?:.*\[.*\].*\[.*\]: )(.*)$
colours=bright_yellow
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# Message after [ERROR]
regexp=\[ERROR\](?:.*\[.*\].*\[.*\]: )(.*)$
colours=bright_red
=====

# Brackets in green
regexp=\[|\]
colours=green
=====

# [INFO] in green
regexp=\[INFO\]
colours=bright_green
=====

# [WARN] keyword in yellow
regexp=\[WARN\]
colours=bright_yellow
=====

# [ERROR] keyword in red
regexp=\[ERROR\]
colours=bright_red
=====

# Timestamp in cyan
regexp=\[[0-9]+\.[0-9]+\]
colours=cyan
=====

# Node names. Assuming node names are alphanumeric with underscores.
regexp=\[[a-zA-Z0-9_]+\]:
colours=magenta
=====

# Colon after the node name in cyan
regexp=(?<=\w)\:
colours=cyan
=====