Conditional Keep Inventory

### Main changes

* Added last command arguments
* Made command globally working (can still have bugs)
* Set some command outputs to be displayed to all OP members

### Minor changes

* customized the JSON parsed to ensure proper lines and spacings
* renamed the command alias from "cdi" to "cki" ("keep")
* removed useless methods from a few classes, added some
* discovered a not-so-dumb way to parse JSON (I'm proud)
* changed a Mixin invoke method
* Guess what? The version changed as well

### **TODO:**
[✓] Player death Mixins altering drop
    ✓ Check if mod activated
    ✓ Check if keepInventory (vanilla) is true
    ✓ Check if death correspond to the wanted list
    ✓ Check if doVanishingCurse is activated
    ✓ Apply or not Curse of Vanishing if activated
[ ] Usage of config file
    ✓ Creating config file on read if missing
    ✓ Creating config file backup and a new one if error on read
    ✓ Make backup name organised by number
    ✓ Allow restoring backup from number
    ✓ Make restoring able to backup actual config file
    ✓ Reading file on server startup and generate config data
    ✓ Change config data to save gamerules change before stop
    ✓ Save config on server stop
    • Add a "dimension" condition
    : Config file versioning (add version tag)
    : Rename "held_item" to "weapon"
[ ] Use commands to alter config data
    ✓ Create the command
    ✓ Create CDIListArgumentType for command list selection
    ✓ Create JsonArgumentType for command editing config data
    ✓ Create command sub-functions:
      ✓ Use command to toggle auto backup when game starts
      ✓ Use command to add conditions
      ✓ Use command to edit conditions
      ✓ Use command to consult conditions
      ✓ Use command to remove condition
      ✓ Use command to toggle condition (t->f;f->t)
      ✓ Use command to reload config file
      ✓ Use command to save config file
      ✓ Use command to backup config file
      ✓ Use command to list available backups
      ✓ Use command to restore backup
    ✓ Add command alias for easier use
    • Correct the OP broadcast to display as the right user
        -> might wish to use a "command_called" boolean param
[ ] Pure development (post-beta?)
    • Add documentations to (as much as possible) all classes
[ ] And a few tests, as well...

• = working on it
✓ = done
: = v1+
[ ] = not finished