Add Android <= 4.3 AOSP UXSS module.
rename module, handle asyncness.
Fix refs.
Rework the timers.
Add a safety fallback on js load.
Add some common UXSS scripts.
Add refs for Android UXSS

See #3759
Update the title and desc to be more descriptive

See #3759
Land #3759, Android UXSS, with ref/desc fixes

Incidentally, this also closes jvennix-r7#14 (let's see if I can close a
PR by merging from another repo!)

Also fixes #3782 (opened by accident).