[vala] (18 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:

  04d70bc... ci: Add .gitlab-ci.yml
  931fb31... ci: Always deploy
  37eabbf... ci: Add ubuntu lts 16.04 run with gcc
  a3486ab... ci: Build and deploy API documentation
  602d1b9... Use Fedora 29 -- https://bugzilla.redhat.com/show_bug.cgi?i

Commits added to the branch:

  0ed8cad... codegen: Don't create special GArray clear-func for non-nul (*)
  906f76d... codegen: Resolve generics in sizeof-expression of parameter (*)
  f83ecd8... codegen: Use default-value to pass element_size to GArray c (*)
  409136a... gio-2.0: Revert enum-typed flags parameters in Socket API (*)
  0c9534a... gstreamer: Update from 1.15.2+ git master (*)
  2d9c89e... vapi: Update GIR-based bindings (*)
  7d771a0... codegen: Move implicit GValue cast for comparison to Binary (*)
  6d71850... codegen: Use available *_unref functions in G_DEFINE_AUTOPT (*)
  126dee3... codegen: Handle "modulo" operation on floating-types in CCo (*)
  1f885e9... vala: Don't replace assignments for local variables with no (*)
  250f5a9... tests: Add "struct (un)boxing" variant test (*)
  a67b8ec... docs: Bump glib requirement in README.md (*)
  75a87e2... vala: Report error for unsupported operator instead of asse (*)
  93090fa... ci: Add .gitlab-ci.yml
  afe81a0... ci: Always deploy
  79a2081... ci: Add ubuntu lts 16.04 run with gcc
  12308c0... ci: Build and deploy API documentation
  70666be... Use Fedora 29 -- https://bugzilla.redhat.com/show_bug.cgi?i

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