stats.lua: add page 4: active key-bindings list

This is a scrollable page which also works nicely with the terminal
OSD. Typically there are more than 100 bound keys.

It groups the binding using fuzzy property/command/script name after
simple analysis of the command string, and then further sorts the
binding in each group according to the "complexity" of the key itself
(plain keys -> keys with modifiers, alphabetically, etc).

The alignment/grouping style is heavily inspired by @medhefgo's #8924
but otherwise it's an independent implementation.

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