attempt to build a drop-in replacement for Select2

[brandondees]

https://select2.github.io/

it's a very popular jquery-dependent UI component which essentially wraps a list and turns it into a combo-box with a bunch of different mode options (remote data list, infinite scroll list, autocomplete token list, etc). Could be a great trojan horse for getting folks to try out snuggsi by cutting down page weight / render time with ease, then just like they "already have jquery, might as well use it" they can "already have snuggsi, might as well use it".