[TxMt] Missing keyboard shortcut for Replace & Find

[Per Olofsson]

I'm on my third attempt on switching from TM1, but this time it's
actually going pretty smooth. One thing has me stumped though, there's
no keyboard shortcut for Replace & Find? I checked the commit history
and it was reassigned to Replace in f39ac28, leaving Replace & Find
shortcutless. There doesn't seem to be many options left for F and G (is
there a way to bring up a list of all active bindings?), but adding one
for Replace & Find would make my life a lot easier.

Thanks,

-- 
  Per Olofsson
  magervalp at fastmail.fm