Multi-Hotbar

Move to core mod for hotbar expansion

Previous, the swapping was handled all client side with some server side logic added in 3.2. This commit moves to a core mod expanding the player inventory to 36 slots so items can be set via "currentItem" instead of relying on the faux-elongated hotbar. The downside is vanilla server support is dropped. A reimplementation is needed that is used as a fallback when the client connects to a vanilla server or a server that does not have the core mod.
Remove inventory tweaks' access transformer

Check for the core mod when connecting to a server

If it is not found, the behavior reverts to vanilla
Fix the core mod slug name

Fix config defaults not being shown in GuiConfig

Fix hotbar custom keys and relative keys option

Fix single hotbar mode

Add inverse scroll direction config option

Fix #39
Add German some translations

Fix inverted scroll direction

Add message when functions are disable due to mmissing core mod
Fix selection being able to move to non-activated hotbars

Add double tap config option

Fix single hotbar mode rendering wrong item

Fix scrolling in single hotbar mode

Fix single hotbar rendering translating the GUI

Fix modifier key and hotbar button not going to correct hotbar

Fix render stack underflow