Replace the particle inventory with a main menu showing the 7 slots and
unlocked presets, a slot editor with a read-only view for locked slots,
and an entry editor with pickers for designs, choices, colours and icons.
Slots are limited to 10 entries and a particles-per-tick budget.
Team- and user-specific particles become presets built from entries,
tournament and egg hunt particles become fixed reward designs, and the
old particle enums, ParticleEnum and ParticleData are removed. The
particle menu temporarily lists only unlocked presets.
Introduce parameters, particle types, designs and entries that build the
existing particle elements, store each of the 7 particle slots in its own
UserConfig key, and let LobbyPlayer select a slot next to the old enum
particles. Slots 4-5 need a team, 6-7 the server team.
Tick particles from per-player cached always/move lists, drop the
per-instance listeners in Delayed and RandomParticle, and compute
particle viewers once per tick instead of once per spawned point.