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.
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.
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