Divorce biome lib and cleanup code (#11)

* make it boot without biome lib

* make luacheck semi sane

* make fast growth saplings work

* make fast saplings respect nodes there growing on

* make regualr saplings work

* fix some luacheck warnings

* add github actions for luacheck

* bump luacheck line limit, as to gracefully handle long tree rules

* switch over to inline luacheck length rules

* fix screenshot warning

* make tree generation work

* add settings from last night

* comment out new biome lib nonsense added

* tune spawning to be better

* turn down fallback ratio

* translate new abm patch to not use biome lib

* add ethereal since its still behaving badly :(

.luacheckrc

@@ -1,28 +1,25 @@
-std = "lua51+minetest"
 unused_args = false
 allow_defined_top = true
-max_line_length = 999
-max_comment_line_length = 999
 
-stds.minetest = {
-	read_globals = {
-		"minetest",
-		"vector",
-		"VoxelManip",
-		"VoxelArea",
-		"PseudoRandom",
-		"ItemStack",
-		"default",
-		table = {
-			fields = {
-				"copy",
-			},
-		},
-		"dump",
-	}
+exclude_files = {".luacheckrc"}
+
+
+globals = {
+	"minetest",
+	"vector",
+	"VoxelManip",
+	"VoxelArea",
+	"PseudoRandom",
+	"ItemStack",
+	"default",
+	"dump",
+	"moretrees",
 }
 
 read_globals = {
+	string = {fields = {"split"}},
+    table = {fields = {"copy", "getn"}},
+
 	"biome_lib",
 	"stairsplus",
 	"stairs",