Backport of Functional Storage features for Minecraft 1.12.2 (Forge).

Implemented Features

Compared with traditional 1.12.2 drawer mods, this project is closer to modern Functional Storage interaction patterns:

Storage upgrades use a multiplicative scaling model
Drawer contents, upgrades, and config are preserved in item NBT after block break
Drawer items can expose IItemHandler capability for cross-mod interaction
Collector upgrade supports both dropped-item and fluid collection behaviors

Main Content

Notes:

Storage upgrades are calculated multiplicatively instead of single-tier overwrite
Default multipliers: copper x8, gold x16, diamond x24, netherite x32
Upgrades affect normal storage, fluid capacity, and controller range calculations
If removing an upgrade causes stored amount to exceed new capacity, that slot is locked and cannot be extracted directly
If holding a higher-level storage upgrade, it can still directly replace a lower-level one
Upgrade conflict checks are centralized (for example, Void Upgrade cannot be installed more than once)

Notes:

Void Upgrade discards overflow of matching items/fluids
Redstone Upgrade outputs signal based on fill ratio
Pulling / Pushing interact with adjacent item/fluid capabilities
Collector Upgrade collects dropped items from the block in front and collects fluids at a slower interval
Directional functional upgrades store facing in upgrade item NBT; sneak-right-click to cycle direction

When a drawer block is broken or middle-click picked, contents and upgrades are written into item TileData
Normal drawer items and compacting drawer items expose IItemHandler capability
Other mods can interact with drawer items as containers
Tooltip displays stored content and amounts