Add +colN perk column search with quote-safe parsing and autocomplete

[delphiactual]

Lets perk:/perkname:/exactperk: restrict matches to specific perk columns via a +colN suffix (e.g. rangefinder+col3, repeatable as +col3+col4), counting an item's visible perk columns from the left.

• Re-attach a trailing +colN run to a quoted filter's args in the lexer so perkname:"firefly"+col3 works the same as the unquoted form (the suffix otherwise fell outside the quotes and was silently dropped).
• Autocomplete +col1..+col5 as soon as a + is typed right after a perk value, with or without quotes and without a separating space. Scoped to perk filters, so multiquery + filters like dupe: are unaffected.
• Tests: parsePerkColumns units, real-item column filtering (incl. the quoted regression), lexer snapshots, and autocomplete + dupe cases.

Closes #11724

[bhollis]

I don't really think specific-column searches make sense. Don't you think it'd be nicer to have a "perks that can be selected together" search e.g. perkname:A&B?

[Revadike]

One example could be if you want to search guns with a damage perk in the left column

[bhollis]

I mean, I guess I won't fight it too hard but targeting specific columns seems extremely niche vs. expressing what you want more directly (e.g. "I want both of these perks to be usable at once")