With this, the WML unit tests are as clean of schema errors as they can get
The two remaining errors are unit tests for dealing with invalid input,
so they are intentionally violating the schema.
And related commits.
This reverts commit 545253ec2b.
This reverts commit 1215f65eb8.
This reverts commit 11664f4024.
This reverts commit e948df3424.
This reverts commit 3781e7839f.
This commits were reverted to exclude them from wesnoth 1.13.2 release because:
1) We are still unsure about the best name oftthese attributes
2) This breaks multiple campaigns, including LoW and the tutorial.
Feel free to revert this revert after 1.13.2 when thse issues can be solved..
There is some WML in data/test/scenarios/ that causes wmlindent to
misbehave (bug #22264 and possibly others awaiting a more thorough
diagnosis), so that subdir is not part of this commit.