Parameters:
- name= Scenario name
- size= Size category (S, M, L, XL, H, XH, or G)
- underground= either "enabled" or "disabled"; defaults to "enabled"
- description= Scenario description text.
- victory= Victory conditions. Existing icons, with default in bold:
- loss= Loss conditions. Existing icons, with default in bold:
- allies= list of allied colors. (There's always at least the player's own color.)
- enemies= list of enemy colors. (This can actually be blank in some maps.)
- bonus= the two or three available bonus items
- difficulty= the default difficulty level for this map. Defaults to Hard, the middle level.