Boats, carts mods: Use 'initial_properties' table

mods/boats/init.lua

@@ -33,6 +33,7 @@ end
 --
 
 local boat = {
+	initial_properties = {
 		physical = true,
 		-- Warning: Do not change the position of the collisionbox top surface,
 		-- lowering it causes the boat to fall through the world if underwater
@@ -40,6 +41,7 @@ local boat = {
 		visual = "mesh",
 		mesh = "boats_boat.obj",
 		textures = {"default_wood.png"},
+	},
 
 	driver = nil,
 	v = 0,

mods/carts/cart_entity.lua

@@ -1,10 +1,12 @@
 local cart_entity = {
+	initial_properties = {
 		physical = false, -- otherwise going uphill breaks
 		collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
 		visual = "mesh",
 		mesh = "carts_cart.b3d",
 		visual_size = {x=1, y=1},
 		textures = {"carts_cart.png"},
+	},
 
 	driver = nil,
 	punched = false, -- used to re-send velocity and position