epicardium: added textbuffer API

Signed-off-by: Mateusz Zalega <mateusz@appliedsourcery.com>
2 jobs for !101 with msgctl/textbuffer_api in 44 seconds (queued for 2 seconds)
latest detached
Status Name Job ID Coverage
  Build
passed build #3632

00:00:28

 
  Test
passed lint #3633

00:00:16