Generic dungeon crawler 22

Made for the dcjam2022 in one week. Written mostly from scratch in Go using OpenGL, only using a GUI library I had already been working on and some 3D model loading code I had written before.

Controls: W/A/S/D to move, Q/E to rotate, use the mouse to interact with the inventory and chests. Right click items on the hotbar to use them.

Press F7 to enter edit mode. In there, you can left click to build a wall and right click to remove a wall. Type 1/2/3/4 to place stairs in different orientations. Chests and monsters are currently hardcoded.

The game uses a (possibly unique) format for the dungeon. It is technically a straight forward voxel world like Minecraft, except that in every dimension every second voxel is large and the ones in between are small, which enables building rooms with thin walls. Try the editor to see how that works.