Add config for luacheckrc and emacs

.dir-locals.el

@@ -0,0 +1,5 @@
+((nil (tab-width . 8))
+ (lua-mode (indent-tabs-mode . t)
+	   (lua-indent-level . 8)
+	   (lua-indent-close-paren-align . nil)
+	   (lua-indent-nested-block-content-align . nil)))

.luacheckrc

@@ -0,0 +1,7 @@
+---*- mode: lua -*-
+read_globals = {
+	"advtrains", "doc", "dlxtrains", "minetest",
+	"table" = {
+		fields = {"copy"},
+	},
+}