Update all exercises to use generator

- [ ] linked-list
- [x] list-ops
- [x] prime-factors
- [ ] simple-linked-list
- [x] custom-set
- [x] palindrome-products
- [x] proverb
- [x] pythagorean-triplet
- [x] queen-attack
- [x] robot-simulator
- [x] saddle-points https://github.com/exercism/perl5/pull/535
- [x] simple-cipher https://github.com/exercism/perl5/pull/535
- [x] accumulate https://github.com/exercism/perl5/pull/407
- [x] all-your-base https://github.com/exercism/perl5/pull/408
- [x] allergies https://github.com/exercism/perl5/pull/264
- [x] anagram https://github.com/exercism/perl5/pull/265
- [x] atbash-cipher https://github.com/exercism/perl5/pull/266
- [x] beer-song https://github.com/exercism/perl5/pull/267
- [x] binary-search https://github.com/exercism/perl5/pull/269
- [x] binary-search-tree https://github.com/exercism/perl5/pull/408
- [x] bob
- [x] clock
- [x] crypto-square https://github.com/exercism/perl5/pull/408
- [x] difference-of-squares https://github.com/exercism/perl5/pull/408
- [x] etl #360
- [x] food-chain https://github.com/exercism/perl5/pull/408
- [x] gigasecond #308
- [x] grade-school
- [x] grains
- [x] hamming
- [x] hello-world
- [x] house https://github.com/exercism/perl5/pull/408
- [x] kindergarten-garden https://github.com/exercism/perl5/pull/408
- [x] largest-series-product https://github.com/exercism/perl5/pull/408
- [x] leap
- [x] luhn
- [x] matrix https://github.com/exercism/perl5/pull/408
- [x] meetup #309
- [x] minesweeper https://github.com/exercism/perl5/pull/408
- [x] nucleotide-count
- [x] ocr-numbers https://github.com/exercism/perl5/pull/408
- [x] pascals-triangle #317
- [x] phone-number
- [x] pig-latin #325
- [x] raindrops
- [x] rna-transcription
- [x] robot-name https://github.com/exercism/perl5/pull/328
- [x] roman-numerals
- [x] say
- [x] scrabble-score
- [x] secret-handshake
- [x] series
- [x] sieve
- [x] space-age
- [x] strain https://github.com/exercism/perl5/pull/417
- [x] sublist
- [x] sum-of-multiples
- [x] triangle
- [x] twelve-days https://github.com/exercism/perl5/pull/331
- [x] two-fer
- [x] word-count
- [x] wordy

❎ ~~binary~~ DEPRECATED
❎ ~~point-mutations~~ DEPRECATED
❎ ~~trinary~~ DEPRECATED
❎ ~~hexadecimal~~ DEPRECATED

Start with the unchecked linked-list and simple-linked-list entries in the checklist, then inspect the generator conventions used by the completed exercises and referenced pull requests. Done means the remaining non-deprecated exercises use the generator and the checklist can be updated accordingly.

Written by the indexing model from the issue text.