[vala] (14 commits) Non-fast-forward update to branch wip/ci

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/ci' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  15ef894... ci: Add .gitlab-ci.yml
  c0f6718... ci: Always deploy
  63b8463... ci: Add ubuntu lts 16.04 run with gcc
  35a12c9... ci: Add ubuntu lts 14.04 run with gcc
  95e7f5b... ci: Build and deploy API documentation
  68deb34... Use Fedora 29 -- https://bugzilla.redhat.com/show_bug.cgi?i

Commits added to the branch:

  5c19009... gsignal: get_detail_cexpression/get_signal_name_cexpression (*)
  abbdfdd... tests: Extend "detailed signal" test to increase coverage (*)
  ed72aa2... gsignal: Use guint to represent flags-enum in custom GMarsh (*)
  a8d1c68... gsignal: Move disconnect error from signal-module to semant (*)
  371512e... tests: Extend "struct with delegate" test to increase cover (*)
  0d09b1d... tests: Add "method ccode return-type" test to increase cove (*)
  9199f6a... ccodegen: Use unsigned default value for flags-enum (*)
  2703619... vala: Allow assignment of 0U to enum types (*)
  acc8789... ci: Add .gitlab-ci.yml
  865e233... ci: Always deploy
  8ac0a62... ci: Add ubuntu lts 16.04 run with gcc
  2d56aeb... ci: Add ubuntu lts 14.04 run with gcc
  8e44423... ci: Build and deploy API documentation
  2d4f3aa... Use Fedora 29 -- https://bugzilla.redhat.com/show_bug.cgi?i

(*) This commit already existed in another branch; no separate mail sent