* wesnoth-mode.el: Update history for upcoming release.

* wesnoth-mode.el: Update history for upcoming release.
  (wesnoth-mode-version): Updated to 1.2.4+git.
  (wesnoth-indent-preprocessor-bol, wesnoth-indent-savefile): Removed
  variables.  WML convention is now set firmly enough that they are no longer
  required.
  (wesnoth-element-closing, wesnoth-element-opening, wesnoth-element): Removed
  functions.
  (wesnoth-element-closing, wesnoth-element-opening, wesnoth-element): Added
  new constants.
  (wesnoth-tags-list): Added several new tags.
  (wesnoth-build-completion): Updated docstring.
  (wesnoth-insert-tag): Operate across prefix-arg number of elements instead
  of a region.  Improved accuracy of tag positioning considerably.
  (wesnoth-insert-element-separately): New function.
  (wesnoth-insert-and-indent): No longer move to the end of the line.  Stay
  where positioned by `wesnoth-indent'.
  (wesnoth-navigate-element): New macro.
  (wesnoth-forward-element, wesnoth-backward-element): Use it.
  (wesnoth-search-for-matching-tag): New macro.
  (wesnoth-jump-to-matching): Use it.
  (wesnoth-wml-start-pos): Fix bug where `buffer-size' was used over
  `point-max' for search bound.
  (first-column-indent-p): New function.
  (wesnoth-indent): Use it.  Use wesnoth-element.* constants over obsoleted
  functions.  Minor clean-up.
  (wesnoth-within-define): Minor clean-up.
  (wesnoth-determine-context, wesnoth-check-structure): Use wesnoth-element.*
  constants over obsoleted functions.
  (wesnoth-check-tag-names): Use wesnoth-element.* constants over obsoleted
  functions.  Minor clean-up.