menu_displaylist: convert the settings-entry runs to row tables

Sixteen runs of the parse-settings macro - seventy-five call sites -
become static row tables consumed by one loop, each a readable list
of label, parse type and empty-entry flag, with platform guards
carried inside the tables and runs trimmed where a guard would have
split. One hundred four source lines gone; the displaylist dump is
byte-identical across all 212 types.

Measured honestly: the text saving is 460 bytes on this
configuration - the compiler was already tail-merging these
repetitive sites - so in this file the campaign's yield is surface
and readability, not binary size, and the numbers are reported as
such.

Author: libretroadmin