Turned all boot messages into clean minetest.log() calls

- Turned all the 'print' calls at server's boot to 'minetest.log' in order to
   render it more clearly

mods/plantlife_modpack/cavestuff/init.lua

@@ -9,4 +9,4 @@ dofile(minetest.get_modpath("cavestuff").."/mapgen.lua")
 
 -----------------------------------------------------------------------------------------------
 
-print("[Mod] "..title.." ["..version.."] ["..mname.."] Loaded...")
+minetest.log("action", "[Mod] "..title.." ["..version.."] ["..mname.."] Loaded...")