Ensure no conflicting settings are specified in plandos

[fenhl]

The disable field on Setting_Info is supposed to ensure that incompatible settings, such as glitched logic and entrance randomizer, aren't selected together. It does this by disabling the setting's GUI element and setting it to its disabled_default value. However, nothing is validated when settings are specified via plando. In the case of glitched logic + ER, seed generation fails later (because it will try to shuffle nonexistent entrances), but with #1531 this lack of validation can lead to softlocks. This PR adds this validation, which also makes the already failing combinations fail faster and with a better error message.

I've done a quick test and this seems to be working as expected, but I'm not very comfortable with the plando section of the code.

[cjohnson57]

Note that this PR prevents 2 conflicted settings set in plando, but if there's a setting in plando that conflicts with an effective GUI setting it won't catch it. This will likely be added later.