MP Item Spawns - Convert SP items to fixed timer spawns

[tobiasksu]

As an extension of Issue #200 and previous work on Miasmic's "arena" mod, I'd like to see the following for how SP item spawns are handled in MP:

• SP item spawn with default attributes (respawns = false, index = 0) converted to a network sync'd one-time pickup which is immediately available on level load, instead of current mostly undefined state (as of olmod 0.5.4). This is most typical of someone accidentally placing an SP item spawn.
• Use the "respawns" field to specify whether it's a one-time pickup or should respawn after pickup.
• If respawns=true => Use the "index" field to specify the duration (in seconds) to wait to respawn the same item
• If respawns=false => Use the "index" field to specify the duration after the match begins to spawn the item

This works in conjunction with the existing randomized spawns we have always used in MP levels, so can be mix & match, all randomized, or all specific item spawns on timers.

[roncli]

I am uncomfortable using something called "index" for a timer. What is this index normally used for?

[tobiasksu]

It's unused, always 0 (I'll double check but I want to say Arne also uses the index field on N000 mine entity for LevelPost swapping)

[roncli]

I can't find any evidence that EntityPropsItem is even used. 🤔 How do you intend to get the value read?

[tobiasksu]

I won't be around a computer until Monday but I have a working commit I checked in earlier this week but haven't PR'd until I can stress test it more. (Have only really tested it against TBDB Arena, Ascent, and stock maps)

tobiasksu@181a854

[roncli]

If you haven't yet, put this into a PR, and I'll go over it. :)

[roncli]

@tobiasksu Does #203 fix this in 0.5.5?