update seed_emc_map.json

[obslsessed]

with this, almost every survival-obtainable item has an emc value. the values were copied directly from projecte when available, and were otherwise given a best-effort emc value.

notes:

• dragon egg and dragon head have no emc values, as requested
• these items are to be given emc values as of later:
  • wither skeleton skull, elytra, and totem of undying
• water bottles, and therefore, potions, and therefore, tipped arrows, have no emc values
  • the emc mapper has to be updated to understand the concept of brewing potions
• concrete blocks have no emc value
  • this might have to be done manually or the emc mapper has to be updated to understand the concept of world interactions
• dyed shulker boxes don't have emc
  • the emc mapper has to be updated to understand the concept of dying items

[Skirlez]