[vala] (13 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:

  3e777e5... ci: Add .gitlab-ci.yml
  31fcaf1... ci: Always deploy
  9e95376... Use Fedora 29 -- https://bugzilla.redhat.com/show_bug.cgi?i
  876bfcb... ci: Add ubuntu lts 16.04 run with gcc

Commits added to the branch:

  8b280ea... codegen: Rename to CCodeMethodCallModule.generate_enum_to_s (*)
  ffc53c4... codegen: Allow to associate CCodeFile to actual SourceFile (*)
  5d7b6a1... codegen: Only emit declaration of *_register_type if needed (*)
  2f66164... tests: Add "ModuleInit" test to increase coverage (*)
  4e4ce22... tests: Add "to_string" enum test to increase coverage (*)
  3397767... tests: Add "struct in array" test to increase coverage (*)
  8312c8b... tests: Add "null-terminated array" delegate test to increas (*)
  b488cd2... tests: Add "constructor chain up" generics test to increase (*)
  cc55883... tests: Add "custom types" struct tests to increase coverage (*)
  74fb17a... ci: Add .gitlab-ci.yml
  70b70e1... ci: Always deploy
  c325b8b... Use Fedora 29 -- https://bugzilla.redhat.com/show_bug.cgi?i
  00dd640... ci: Add ubuntu lts 16.04 run with gcc

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