Änderungen

Experimental support for using lep/jassdoc as common.j/Blizzard.j
replacement
The implementation should probably be improved. This allows us to build
the standard library PTR branch by adding jassdoc as a grill dependency:
- https://github.com/lep/jassdoc:patch-1.31
If this dependency if found, it will be preferred over the regular files
in the root of the _build folder.
 (commit: 450859e)