Add lint plugins for remark-stringify behavior

[vweevers]

I.e. hallmark should warn about what remark-stringify is gonna do.

• [ ] TBD: [require('remark-lint-definition-spacing')]
• [x] [require('remark-lint-emphasis-marker'), '_']
• [ ] TBD: [require('remark-lint-fenced-code-flag')]
• [x] TBD: [require('remark-lint-fenced-code-marker'), '']`
• [ ] [require('remark-lint-file-extension'), 'md']
• [ ] TBD: [require('remark-lint-final-definition')]
• [ ] TBD: [require('remark-lint-first-heading-level')]
• [ ] [require('remark-lint-heading-style'), 'atx']
• [ ] TBD: [require('remark-lint-link-title-style'), '"']
• [ ] [require('remark-lint-maximum-heading-length'), 60]
• [x] [require('remark-lint-maximum-line-length'), 80]
• [ ] TBD: [require('remark-lint-no-consecutive-blank-lines')]
• [x] [require('remark-lint-no-duplicate-definitions')]
• [ ] [require('remark-lint-no-duplicate-headings-in-section')]
• [ ] TBD: [require('remark-lint-no-emphasis-as-heading')]
• [ ] TBD: [require('remark-lint-no-empty-url')]
• [ ] TBD: [require('remark-lint-no-file-name-articles')]
• [ ] TBD: [require('remark-lint-no-file-name-consecutive-dashes')]
• [ ] TBD: [require('remark-lint-no-file-name-irregular-characters')]
• [ ] TBD: [require('remark-lint-no-file-name-mixed-case')]
• [ ] TBD: [require('remark-lint-no-file-name-outer-dashes')]
• [x] TBD: [require('remark-lint-no-heading-content-indent')]
• [ ] TBD: [require('remark-lint-no-heading-indent')]
• [ ] TBD: One of
  • [require('remark-lint-no-heading-punctuation')]
  • [require('remark-lint-no-heading-like-paragraph')]
• [x] [require('remark-lint-no-html')]
• [ ] TBD: [require('remark-lint-no-missing-blank-lines'), {exceptTightLists: true}]
• [ ] TBD: [require('remark-lint-no-multiple-toplevel-headings')]
• [ ] TBD: [require('remark-lint-no-paragraph-content-indent')]
• [ ] TBD: [require('remark-lint-no-reference-like-url')]
• [ ] TBD: [require('remark-lint-no-shell-dollars')]
• [ ] TBD: [require('remark-lint-no-table-indentation')]
• [ ] [require('remark-lint-no-tabs')]
• [x] [require('remark-lint-no-unneeded-full-reference-image')]
• [x] [require('remark-lint-no-unneeded-full-reference-link')]
• [x] [require('remark-lint-ordered-list-marker-value'), 'ordered']
• [x] TBD: [require('remark-lint-rule-style'), '---']
• [x] [require('remark-lint-strong-marker'), '*']
• [x] [require('remark-lint-table-cell-padding'), 'padded']
• [x] [require('remark-lint-table-pipe-alignment')]
• [x] [require('remark-lint-table-pipes')]
• [x] [require('remark-lint-unordered-list-marker-style'), '-']

[vweevers]

Note to self: continue at https://github.com/wooorm/remark-preset-wooorm/blob/46e0e1f467eee269c7505dcff23977ea96da0678/index.js#L30

[vweevers]

Hm this doesn't have to block a first release. If we add hallmark to Level, then gradually add more plugins, we'll be notified by greenkeeper if anything breaks :)