Add a Timer to the Lua API to suspend interactive scripts

[API-Beast]

Right now the only way to wait for some time in a lua script is to do a busy wait:

function sleep(a) 
    local sec = tonumber(os.clock() + a); 
    while(os.clock() < sec) do 
    end 
end

However this will lock up the entire program until the sleep function has returned.

If a Timer class or similar would be added, or simply a callback that is called every n seconds it would open up some new ways scripts can interact with the user. In my case I was trying to implement a timeout to WebSocket so that if it hasn't managed to connect yet after 3 seconds it would stop trying to connect and update the UI to allow the user to manually restart the connection process.

API could look something like this:

local timer = Timer{delay=1.0, onTick=function() print("Tick Tock") end, repeat=true}
timer:start()