Handle module caching in a Team Create friendly way

[vocksel]

As detailed in the Caveats section of the README, support for a team environment is currently very poor. We need a better system for importing modules that will not interfere with other users.

One proposed by einstienK on the devforums looks incredibly promising and should be exactly what we need:

local function assertf(c,m,...)
	if c then return end
	error(m:format(...),0)
end

local loading,ERR = {},{}
local function customRequire(mod)
	local cached = loading[mod]
	while cached == false do wait() cached = loading[mod] end
	assertf(cached ~= ERR,"Error while loading module")
	if cached then return cached end
	local s,e = loadstring(mod.Source)
	assertf(s,"Parsing error for %s: %s", mod:GetFullName(), tostring(e))
	loading[mod] = false
	local env = setmetatable({
		script = mod;
		require = customRequire;
	},{__index=getfenv()})
	s,e = pcall(setfenv(s,env))
	if not s then loading[mod] = ERR end
	assertf(s,"Running error for %s: %s", mod:GetFullName(), tostring(e))
	loading[mod] = e return e
end

customRequire(firstModule)

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It's just a matter of implementing this now. I have other projects to worry about right now but this is a top priority when I get back to working on Code Cop. (If anyone else stumbles upon this and wants to give it a shot tho, feel free)

Once implemented we can also delete the Caveats section as it only applies to this issue.