Add config options to disable modifying the Origins mod and max height

[ultimatejacob27]

When choosing the Elytrian in origins, it now has the ability to propel forward, despite only having elytra. If this is a feature, it would be nice if it could be disabled. Also, while the max height alludes to the story of Icarus, I would rather disable that feature.

[CammiePone]

@UpcraftLP i think you made another oops in the rewrite

also, if you want to disable the max height, just set it to something like 3 million