Updated IridiumCore and dependent APIs

[sh0inx]

mostly build script changes

• updated IridiumCore to 1.8.9
• updated IridiumSkyblockAPI to 4.0.8
• updated SuperiorSkyblockAPI to use new repo
• updated script to include LandsAPI because this wasn't here for some reason
• removed MassiveCore and MassiveCore Factions because this is no longer available to compile with - see their github profile
• removed MWDPlaceholders for the same reason