Little post-Pyler tweaks

Hi everyone. Some small tweaks to fix and adjust various things in the large patch yesterday.

• Adjusted slide-jumping to improve vertical lift.

• Fixed a bug causing Mitra's questline to become softlocked.

• Made changes to how run time is calculated to make it more framerate-independent.

• Added a "Use pre-nerf Sodden Harpoon Gun" preference to the settings menu to allow players to contest their existing speedrun times. I do not recommend that new players enable this setting. It will be removed in the future, probably in the next large content update.

Thanks for the feedback and notes, they're very helpful. Hope everyone is having a nice day.