Map Editor: Implement the Rando Set Sequence functionality for Map Creation

[MiningPie]

Would allow you to choose the set order the clusters rise in your map. This would mean that not every map would have to use the elevators at buttons 6 and 8, isn't forced to only use a few platforms for buttons 13-17, can have springpads show up earlier than button 24, etc. This would also allow you to easily make shorter maps that dont use every button, as you can just put cluster 31 earlier in the sequence.

[LukeSaward]

We could have a sequence list in the beginning of the map file and have an option to set the sequence and parse the sequence in the same way as the rando component does.