This adds running the WML schema validation in travis. It also updates the schema itself and fixes a few WML errors so that core and all campaigns under all difficulties pass the schema validation.
- Allow for variable substitution in filter tags (mostly)
- Fix real not matching numbers like .5
- Support x,y=recall,recall
After this commit, there are no schema errors in the tutorial.
Currently this is disabled by default
Use --validate command-line argument to enable
The following new features were added in the schema format:
* Union, intersection, and list types
* Keys can specify a union of known types on-the-fly
* Key and tag names can include wildcards (* and ?, glob-style)
* Tags support any_key=yes, which means unrecognized subtags will be ignored
* Tags and keys support deprecated=yes (unimplemented)
* Specify max=infinite instead of max=-1
