Rename mcl_autogroup to _mcl_autogroup

This should fix some autogroup-related issues due to loading order.

mods/CORE/_mcl_autogroup/README.txt

@@ -0,0 +1,10 @@
+This mod automatically adds groups to items based on item metadata.
+
+Specifically, this mod has 2 purposes:
+1) Automatically adding the group “solid” for blocks considered “solid” in Minecraft.
+2) Generating digging time group for all nodes based on node metadata (it's complicated)
+
+See init.lua for more infos.
+
+The leading underscore in the name “_mcl_autogroup” was added to force Minetest to load this mod as late as possible.
+As of 0.4.16, Minetest loads mods in reverse alphabetical order.

mods/CORE/_mcl_autogroup/description.txt

@@ -0,0 +1 @@
+MineClone 2 core mod which automatically adds groups to all items. Very important for digging times.

mods/CORE/_mcl_autogroup/init.lua

@@ -1,11 +1,3 @@
---[[ This mod automatically adds groups to items based on item metadata.
-
-Specifically, this mod has 2 purposes:
-1) Automatically adding the group “solid” for blocks considered “solid” in Minecraft.
-2) Generating digging time group for all nodes based on node metadata (it's complicated)
-
-]]
-
 --[[ Mining times. Yeah, mining times … Alright, this is going to be FUN!
 
 This mod does include a HACK to make 100% sure the digging times of all tools match Minecraft's perfectly.

mods/CORE/_mcl_autogroup/mod.conf

@@ -0,0 +1 @@
+name = _mcl_autogroup

mods/CORE/mcl_autogroup/mod.conf

@@ -1 +0,0 @@
-name = mcl_autogroup

mods/HUD/mcl_inventory/creative.lua

@@ -11,7 +11,7 @@ for _, f in pairs(builtin_filter_ids) do
 end
 
 --[[ Populate all the item tables. We only do this once. Note this mod must be
-loaded after mcl_autogroup for this to work, because it required certain
+loaded after _mcl_autogroup for this to work, because it required certain
 groups to be set. ]]
 do
 	for name,def in pairs(minetest.registered_items) do

mods/HUD/mcl_inventory/depends.txt

@@ -1,3 +1,3 @@
 mcl_init
-mcl_autogroup?
+_mcl_autogroup?
 3d_armor?

mods/ITEMS/mcl_tools/depends.txt

@@ -1,2 +1,2 @@
 mcl_sounds
-mcl_autogroup
+_mcl_autogroup