Make configuration state persistent

store.js is now used to make configuration options persistent across
page visits and refresh.

Also, I added a MOTW (Mark Of The Web) comment so running the program
from the local file system on IE doesn't generate an annoying warning
dialog.
Regularize js8080.js formatting

No functional change.

I've tried to stick to the original formatting, but considering the
number of divergent changes I've made, I went and normalized the
formatting and got rid of some jshint warnings (missing/extra
semicolons, redundantly declared variables, inconsistent spacing).