[vala] (4 commits) Non-fast-forward update to branch wip/issue/1128

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/issue/1128' 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:

  8f04b26... tests: Use vapigen to parse generated gir
  3343a10... vala: Set this_parameter of method representing property ac
  bc88d1a... girwriter: Write instance-parameter elements

Commits added to the branch:

  01b2de5... vala: Set this_parameter of method representing property ac (*)
  d138ee9... vala: Let method representing property accessor inherit GIR (*)
  90a4c26... tests: Extend "girparser" test and use vapigen to parse gen (*)
  0fb0390... girwriter: Write instance-parameter elements

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