export config a11y speedup prototype

[Caolán McNamara]

The export config page is still super slow with a11y enabled, the
attached prototype patch knocks about 5 minutes off it (in dbgutil
mode).

It's clearly a rubbish patch, statics need to become member variables
and I need to find the right place to invalidate the cache when
something gets added/removed from the list and then wrap the whole thing
with some fancy class name so it looks like it was designed rather than
grown. I probably won't get around to looking at this again until next
week so if someone wants to take this and run with it in the meantime
feel free.

C.
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