[vala] (7 commits) Non-fast-forward update to branch wip/issue/767

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/issue/767' 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:

  30b4216... codegen: Move get_type_signature() to DataType
  3d465de... codegen: Move try_cast_variant_to_type() to GVariantModule.
  d604096... codegen: Implement silent-cast for basic typed variants
  5433e68... WIP Extend silent-cast support to type with known type sign

Commits added to the branch:

  12957d1... tests: Add a field starting with a digit test (*)
  230cd35... tests: Add more invalid "assignment" tests to increase cove (*)
  7584b13... ccode: Rename CCodeFeatureTestMacro to CCodeDefine and gene (*)
  9a9ffd7... codegen: Move get_type_signature() to DataType (*)
  5baacba... codegen: Move try_cast_variant_to_type() to GVariantModule. (*)
  95522f7... codegen: Implement silent-cast for basic typed variants
  675778a... WIP Extend silent-cast support to type with known type sign

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