* Non-int versions of `Point` and `Displacement`
This will allow us to make some structs, such as `ActorPosition`, much
smaller.
* ActorPosition: Use smaller types
`Monsters`: 56K -> 46K
* player.cpp: Reduce size of `DirectionSettings`
* CrawlTable: Displacement -> DisplacementOf<int8_t>
* CrawlTable: vector<vector> -> array<vector>
Also only allocate one vector during construction instead of two.
A bit less indirection.
* Monster#enemyPosition: Point -> WorldTilePosition
sizeof(Monster): 240 -> 232
* Monster: Further optimize field layout and sizes
sizeof(Monster): 232 -> 208
`Monsters` is down to 40,000 bytes
* DMonsterStr: _mx/_my -> position
1. Do not modify the map after loading. Instead, return string views
(guaranteed to be null-terminated) from look up functions and return
the key directly if not found.
2. Use an `unorded_map` instead of `map` where available (C++20).
Saves a bit of RAM (~50 KiB) and improves lookup performance.
Previously this was falling back to FunctionCase, leading to inconsistent casing of class methods throughout the codebase. Applied to Item as an example.
* Move declaration of dItems to items.cpp
This array is never used in dungeon generation, it's closely related to Items so should be kept together. Ideally managing dItems can become responsibility of a container for Items, which will handle adding/removing items from the list and keeping the positions in sync.
* Rename SetPlrHandItem to match purpose/use
* Give more descriptive name to GetPlrHandSeed
This function sets a new seed on a given item struct, not just the held item.
* Don't use HoldItem as a temporary for the players initial inventory
* Take Item by reference in RespawnItem
* Don't use holdItem as a temporary when dropping gold on death
* Update DeadItem to take item by reference, and refer to it consistently
Move code which invalidates the source of dropped items to the caller
Most call sites use a temporary item instance or remove the item from the container, so there's no real point invalidating the item after it's been copied to the drop list.
Update DeadItem to take position instead of player references