Merge branch 'pure_fork_join' into 'master'

Change to pure fork-join task model

See merge request !11
4 jobs from master in 3 minutes 42 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #3136
build_cmake

00:43

 
  Test
passed #3137
run_tests

00:41

 
  Sanitizer
passed #3139
run_address_sanitizer

01:20

passed #3138
run_thread_sanitizer

00:57