- multilevel support:
- full support on auto folder and persistent levelpacks
- no support on commandline
- full composer support
- global read only attribute "SublevelNumber" for level selection
- multilevel title with trailing "#" will cause numbered sublevel titles
- multilevel title without trailing "#" indicates lua based titles:
- global attribute "SublevelTitle" should be set on level load
- otherwise the default numbered title is used
- sublevels use the id of the multilevel file with appended "[n]",
- no other level id must end on "]"
- sublevel screenshots, thumbs use a suffix "_n" to the filename