Simply Jetpacks

- IMPORTANT NOTICE: This update changes the location and the format of the config files. I recommend you to either delete your current configs, or back up any changes you made to them so you can restore those.
- Added Creative Jetpack. Not Creative as in creative-flight, but as in infinite charge, like the Creative TE items.
- Added Particle Customizers. They can be used to disable or change the type of particles on specific jetpacks.
- Jetpack particles from other players can now actually be seen from a distance
- Jetpacks now also boost sideways and backwards when flying around (it used to only boost forward)
- Tuberous jetpacks can now be tuned in the configs
- Added config to disable the "Hold Shift for details"
- Improved armored jetpack item textures
- Hopefully fixed a crash with Morph interaction
- I would call this 0.2.1.0, but it would probably get confused with 0.2.0.1. :V