--- Filters the items in the given table using the given function.
-- The function is executed for each item in the list. If it returns true, the
-- item is kept. If it returns false, the item is discarded.
-- Arguments passed to the function: item, i
-- ...where item is the item to filter, and i is the index in the table the item
-- is located at.
-- @param tbl table The table of values to filter.
-- @param func function<any, number>:bool The filter function to execute - should return a boolean value indicating whether the item provided as the first argument should be kept
-- @returns table A new table containing the values that the given function returned true for.