Fixes to `mcl_meshhand`

- fix actual crash when placing hand in world (undefined function)
- remove node fields redundant with default values
- remove support for `use_texture_alpha_string_modes`
- type annotation
- more explicit functions

mods/PLAYER/mcl_meshhand/init.lua

@@ -1,22 +1,20 @@
 local mcl_skins_enabled = minetest.global_exists("mcl_skins")
 
--- This is a fake node that should never be placed in the world
+---This is a fake node that should never be placed in the world
+---@type node_definition
 local node_def = {
-	description = "",
-	use_texture_alpha = minetest.features.use_texture_alpha_string_modes and "opaque" or false,
-	visual_scale = 1,
-	wield_scale = {x=1,y=1,z=1},
+	use_texture_alpha = "opaque",
 	paramtype = "light",
 	drawtype = "mesh",
 	node_placement_prediction = "",
 	on_construct = function(pos)
-		local name = get_node(pos).name
+		local name = minetest.get_node(pos).name
 		local message = "[mcl_meshhand] Trying to construct " .. name .. " at " .. minetest.pos_to_string(pos)
 		minetest.log("error", message)
 		minetest.remove_node(pos)
 	end,
 	drop = "",
-	on_drop = function() return "" end,
+	on_drop = function(_, _, _) return ItemStack() end,
 	groups = { dig_immediate = 3, not_in_creative_inventory = 1 },
 	range = minetest.registered_items[""].range
 }
@@ -54,6 +52,6 @@ if mcl_skins_enabled then
 	end)
 else
 	minetest.register_on_joinplayer(function(player)
-		player:get_inventory():set_stack("hand", 1, "mcl_meshhand:hand")
+		player:get_inventory():set_stack("hand", 1, ItemStack("mcl_meshhand:hand"))
 	end)
 end