Added a method toCanonicalPath to deal with SO-dependant paths formats
Moved all schema generation to build-tools
Renamed GameMetadata -> EditorGame; SceneMetadata -> EditorScene
Big refactor: removed GameMetadata and SceneMetadata from everywhere
Fix editor tests
Removed metadata from docs; some javadoc clean up
Fix after wrong merge
Merge branch 'smallfixes'

Conflicts:
	editor/desktop/src/main/java/es/eucm/ead/editor/DesktopPlatform.java