jak3: speedrunner mode

[Hat-Kid]

Base implementation of the popup menu and speedrunner mode in Jak 3. Autosplitter is untested because I'm on Linux.

Also a couple of other misc changes:

• Model replacements can now have custom bone weights. Needs the "Use Custom Bone Weights" property (provided by the OpenGOAL Blender plugin) enabled in Blender.
• Better error message for lump syntax errors in custom level JSON files.

[dallmeyer]

works on Windows 👍

few minor things:

• hero mode runs usually have a bunch of secrets unlocked from the start, we should probably enable those? infinite ammo, infinite ecos(?), turbo jetboard, etc
• jak1/2 auto skip the intro cutscene when resetting, so probably we should do the same here?
• blaster mod splits after you switch weapons a few times, when arena-fight-1-resolution closes. should maybe be on arena-fight-1-throne instead, which is after the cutscene? (there are probably a few cases like this throughout the run)

[Zedb0T]

This is not taken in hero mode runs because you want the car to die fast.
https://youtu.be/AnrHvAayHmE?t=227