[vala] (16 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:

  9817a64... coverage: Build gidl-bindings
  8ef297f... ci: Add .gitlab-ci.yml
  84d3f54... ci: Add ubuntu:16.04 run with gcc
  7e880b7... ci: Add ubuntu:18.04 run with gcc
  31f87a9... ci: Add fedora:latest run with clang
  1604308... ci: Add archlinux/base:latest run with gcc
  1b31d59... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  5dc46de... ci: Always deploy

Commits added to the branch:

  77aec59... vala: Parse standalone integer/real literals as expression  (*)
  ab178ea... codegen: Include "glib.h" for G_BEGIN_DECLS/G_END_DECLS usa (*)
  d02167a... codegen: Correctly handle transformation of translated stri (*)
  3d77608... codegen: Use defintions of public header in internal header (*)
  9f32492... vala: Drop --use-header compiler option and enable it by de (*)
  e9c5f4a... vala: Warn about usage of override to implement abstract in (*)
  61e69f4... tests: Extend "DBus signals" test to increase coverage (*)
  25f93c2... gdbus: Use GDBusProxy API to set `g-interface-info` at init (*)
  672a09b... coverage: Build gidl-bindings
  7020e0f... ci: Add .gitlab-ci.yml
  b6543b4... ci: Add ubuntu:16.04 run with gcc
  d46551d... ci: Add ubuntu:18.04 run with gcc
  ecbb59a... ci: Add fedora:latest run with clang
  99fb151... ci: Add archlinux/base:latest run with gcc
  9a1236a... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  e6be357... ci: Always deploy

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