Feature:
Added support for block-based collision removal for both /kaka and /pipi. You can enable or disable it and configure which blocks will instantly remove kaka/pipi particles when they come into contact.

Also added timed auto-removal: particles will be removed even if they never reach the ground. This can also be enabled/disabled and configured in seconds.

New config options:

Code (YAML):

kaka:
  collision_blocks:
   enabled : true
   blocks :
    - WATER
     - LAVA
  auto_remove:
   enabled : true
   duration_seconds : 10

pipi:
  collision_blocks:
   enabled : true
   blocks :
    - WATER
     - LAVA
  auto_remove:
   enabled : true
   duration_seconds : 10