SelectAll method could be faster

[Aidurber]

Version

1.3.2

Here's what went wrong:

With a list of 100,000 items, the selectAll method could be much faster. No need for unneccessary map of options.

allSelected check does a sort too which slows things down considerably.

Did some basic performance.now checks.

allSelected check down from ~44ms to ~0.3ms