Move default stockpile limits to customparams

[sprunk]

Move values from this table to customparams, right now it's undiscoverable and can silently become obsolete if somebody uses a customparam anyway

Beyond-All-Reason/luarules/gadgets/unit_stockpile_limit.lua

Lines 22 to 30 in eb9bbeb

	local isStockpilingUnitNames = { -- number represents maximum stockpile. You can also use stockpileLimit customParam which overwrites whatever is set in this table
	['armmercury'] = 5,
	['corscreamer'] = 5,
	['armthor'] = 2,
	['legmos'] = 8,
	['legmost3'] = 8,
	['legmineb'] = 1,

[ryanbennitt]

First pass at refactor, but couldn't find these units so haven't touched until confirmed they can be deleted:

	['armdecomlvl3'] = 1,
	['armdecomlvl6'] = 2,
	['armdecomlvl10'] = 2,
	['legdecomlvl3'] = 1,
	['legdecomlvl6'] = 2,
	['legdecomlvl10'] = 3, 

[ryanbennitt]

Aha found where they're stored, removed these too