[vala] (9 commits) Non-fast-forward update to branch wip/abi

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/abi' 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:

  95de051... compiler: Add --abi-stability option for future ABI stabili
  43a5692... codegen: Add abi-stability path for classes
  07528ea... codegen: Add abi-stability path for interfaces
  e8a656b... codegen: Add "padding" CCode attributes for classes/interfa
  09b9acc... tests: Add second pass with --abi-stability
  a393e07... ccode: Allow adding of comments to a CCodeStruct
  57dd5e4... codegen: Add public/private separator comments to type/inst

Commits added to the branch:

  5a7300d... codewriter: Don't use string.replace() to apply header_to_o (*)
  c633d80... Release 0.39.5 (*)
  d67de51... compiler: Add --abi-stability option for future ABI stabili
  a15fbd5... codegen: Add abi-stability path for classes
  09ce1b6... codegen: Add abi-stability path for interfaces
  28ff796... codegen: Add "padding" CCode attributes for classes/interfa
  be87b8b... tests: Add second pass with --abi-stability
  432c534... ccode: Allow adding of comments to a CCodeStruct
  db01fb8... codegen: Add public/private separator comments to type/inst

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