[gtk+] (12 commits) Non-fast-forward update to branch wip/otte/shader

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/shader' 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:

  fc97924... gsksl: Split Expression from Node
  3e6df87... gsksl: Turn functions into functions
  5c33bc6... gskslfunction: Change name printing to name getting
  4258193... gskslprogram: Parse global variables
  b697360... xxx: split out function
  fb193e1... gsksl: Introduce GskSlValue
  44a0155... xxx: split expression
  bbb51c5... gsksl: Redo declaration "decorator" parsing
  a9e1d39... gsksl: Parse common layout() specifiers

Commits added to the branch:

  6deeb27... gsksl: Split Expression from Node
  bcd5974... gsksl: Turn functions into functions
  eb3f29f... gskslfunction: Change name printing to name getting
  d6a04b1... gskslprogram: Parse global variables
  519f691... gsksl: Introduce GskSlValue
  5e51200... gsksl: Redo declaration "decorator" parsing
  4ca5a49... gsksl: Parse common layout() specifiers
  ab711bb... gskslexpression: Change is_constant() to get_constant()
  7afdab6... gskslvariable: Store constness of variables
  cdd037a... gsksldeclaration: Throw an error if a variable initializer 
  cd1c24d... gskslvariable: Allow storing an initializer value with a va
  40b8e9f... gskslprogram: Allow variables to have constant initializers