[Commits] [wesnoth/wesnoth] 850dc9: Fix objectives with variables (#992)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/wesnoth/wesnoth
  Commit: 850dc96a3a9d9f21348a92b6136e51a083d1f471
      https://github.com/wesnoth/wesnoth/commit/850dc96a3a9d9f21348a92b6136e51a083d1f471
  Author: Celtic Minstrel <CelticMinstrel at users.noreply.github.com>
  Date:   2017-05-13 (Sat, 13 May 2017)

  Changed paths:
    M data/lua/wml/objectives.lua
    M src/play_controller.cpp

  Log Message:
  -----------
  Fix objectives with variables (#992)

[objectives] now supports delayed_variable_substitution=yes, which means that any
$variables or [insert_tag] are processed when the objectives are shown, rather than
when they are set.

In addition, if $|variable syntax is used to delay substitution of a specific variable,
the variable will now be substituted when the objectives are shown, rather than
being left unsubstituted.