Working on a new upgrade system for liquipacks
Added interface for upgrade items and recipe
Added jetpack upgrade item
Fixed a few bugs
A few things

- Added config gui
- Added configurable tank capacities
- Disabled jetpack upgrade and related features, they will be added in
the future
Started liquidXP upgrade and rewriting GuiTankOptions
Almost done with rewritten GuiTankOptions
Finished rewriting GuiTankOptions
Fixed button width when syncing from server
Added LiquidXP config container and message
Added a recipe handler
Made GuiTankOptions more flexible
Merge branch 'development'