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Make ListHandler pass phan

Phan really didn't like the ad-hoc "use an array for list frame objects"
style. Although I could have annotated each place it complained, or
fallen back on some `array<string,mixed>` type for the ListFrame, it
seemed better just to create a proper class.  Leads to more readable
code and more accurate phan checks.

I also made the $bullet_chars_map static while I was at it.  PHP 7.2
lets you just initialize this statically, saving a bit of extra
work.

Change-Id: If4244406d

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