Get rid of context menu (hold items in hand)

[miskatonicstudio]

Instead of right-clicking a 3D interactive item and switching to the context menu, GOAT should use a "hold item in hand" feature. Currently selected inventory item should appear in Player's hand, with the following features:

• mouse scroll = switch to next/previous item
• LMB = use on currently selected 3D interactive item
• RMB = hide the item (no longer show in hand, but keep as selected)
• scroll when hidden = select next/previous and show in hand

Things to keep in mind:

• the item in hand cannot overlap with the 3D environment, so possibly the Z buffer has to be used
• using the same Godot scene for items in hand and inventory items might cause problems with duplicated logic; the solution is either a separate model for the held object or removing the script from the held instance
• the held object cannot cast shadows; it can be disabled by the developer in the separate model or automatically by GOAT (if reusing inventory item scene)
• it might be possible (in the future) to include the item in hand in a 3D animation, e.g. a key moving toward the lock; for such situations, it might be a good idea to keep the item's actual 3D size

With this feature, perhaps changes will have to be made to RayCast scene.

[miskatonicstudio]

Instead of getting rid of the context menu altogether, this should be one of the available options, and the UI should be changed to allow for more than 8 items. In general, GOAT should offer several types of UIs and interactions, possibly through separate scenes, and allow devs to choose ones that suit their needs best.