Move global core variables to mcl_init

mods/CORE/mcl_init/description.txt

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+Initialization mod of MineClone 2. Defines some common shared variables and sets up initial default settings which have to be set at the beginning.

mods/CORE/mcl_init/init.lua

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+-- Some global variables (don't overwrite them!)
+mcl_vars = {}
+
+--- GUI / inventory menu colors
+mcl_vars.gui_slots = "listcolors[#9990;#FFF7;#FFF0;#000;#FFF]"
+mcl_vars.gui_bg = "bgcolor[#080808BB;true]"
+mcl_vars.gui_bg_img = ""
+
+mcl_vars.inventory_header = mcl_vars.gui_slots .. mcl_vars.gui_bg
+
+-- Set default stack sizes
+minetest.nodedef_default.stack_max = 64
+minetest.craftitemdef_default.stack_max = 64
+
+-- Set random seed for all other mods (Remember to make sure no other mod calls this function)
+math.randomseed(os.time())
+
+

mods/CORE/mcl_init/mod.conf

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+name = mcl_init