Allow autocomplete for input fields when scrobbling manually

[elamperti]

Is your feature request related to a problem? Please describe

dabu says:
(...) there's enough back-and-forth that the 'lock' tool - while it TOTALLY 100% helps sometimes - doesn't help with that particular case. But being able to type "re" and get the whole "Reading, Writing & Arithmetic" album, or "1" and get "10,000 Maniacs", would just save a whooole ton of time

Describe the solution you'd like
The field should be profit from the browser's autocomplete to suggest values entered previously.

Describe alternatives you've considered
Copy-pasting from a list or checking in last.fm the correct name takes a lot of time and effort and sometimes the users may leave a field blank only to correct it later through last.fm

Additional context
Requested and discussed with dabu#2474 over Discord (permalink)