Merge remote-tracking branch 'upstream/master'

I don't know much about github actions, so I hope it works correctly.
The yml file is based on https://github.com/ChaosWormz/teleport-request/blob/master/.github/workflows/build.yml

.github/workflows/luacheck.yml

@@ -0,0 +1,11 @@
+on: [push, pull_request]
+name: luacheck
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: lint
+        uses: Roang-zero1/factorio-mod-luacheck@master
+        with:
+          luacheckrc_url: ""

.luacheckrc

@@ -1,5 +1,5 @@
 read_globals = {
-	"dump", "vector", "minetest",
+	"dump", "vector",
 	"table", "math", "PseudoRandom", "VoxelArea",
 	"stairs", "stairsplus", "skins", "treecapitator",
 	default = {
@@ -10,6 +10,15 @@ read_globals = {
 			}
 		},
 		other_fields = true
+	},
+	minetest = {
+		fields = {
+			registered_nodes = {
+				read_only = false,
+				other_fields = true
+			}
+		},
+		other_fields = true
 	}
 }
 globals = {"snow"}

src/nodes.lua

@@ -377,7 +377,8 @@ nodedef = {
 	-- by player position. ~ LazyJ
 	 -- I made this a little harder to dig than snow blocks because
 	 -- I imagine snow brick as being much more dense and solid than fluffy snow. ~ LazyJ
-	groups = {cracky=2, crumbly=2, choppy=2, oddly_breakable_by_hand=2, melts=1, icemaker=1, cooks_into_ice=1, cools_lava = 1, snowy = 1},
+	groups = {cracky=2, crumbly=2, choppy=2, oddly_breakable_by_hand=2, melts=1,
+		icemaker=1, cooks_into_ice=1, cools_lava = 1, snowy = 1},
 	 --Let's use the new snow sounds instead of the old grass sounds. ~ LazyJ
 	sounds = default.node_sound_snow_defaults(),
 	-- The "on_construct" part below, thinking in terms of layers,