Don't lock the string metatable

Feature Requests Studio Features
#21

Nevermind. newproxy to the rescue!

sandboxstring=function(s)
	local proxy=newproxy(true)
	local meta=getmetatable(proxy)
	meta.__len=function()return #s end
	meta.__index=function(_,k)
		return function(a,...)
			local t={string[k](s,...)}
			for i=1,#t do if type(t[i])=='string'then t[i]=sandboxstring(t[i])end end
			return unpack(t)
		end
	end
	return proxy
end

This is the first time I have ever needed to use newproxy. I feel accomplished.

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