Remove obsolete processing queue class

logic/logic.lua

@@ -1,6 +1,5 @@
 local path = logistica.MODPATH .. "/logic"
 -- once again, order is important
-dofile(path.."/processing_queue.lua")
 dofile(path.."/groups.lua")
 dofile(path.."/network_cache.lua")
 dofile(path.."/network_logic.lua")

logic/processing_queue.lua

@@ -1,16 +0,0 @@
-local ProQ = {}
-ProQ.__index = ProQ
-
-function ProQ.new()
-  local self = setmetatable({}, ProQ)
-  self.queue = {}
-  return self
-end
-
-function ProQ:add_pos(newval)
-  self.value = newval
-end
-
-function ProQ:get_value()
-  return self.value
-end