Built-in functions

Input/output functions
io.clear   -- clear standard output
io.load    -- get string from standard input
io.dump    -- dump objects to standard output
Graphic functions
gfx.init   -- return context of built-in canvas
Timers
Timer.once(f, t)            -- run function f after timeout t ms
Timer.repeat(f, t)          -- run function f every t ms
Timer.repeatWhileTrue(f, t) -- run function f every t while it returns truthy value