Limitations and differences in Markdown handling

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as opposed to regular or rather GitHub-flavoured Markdown:

• multiple lines for list items must end with one or more spaces on the previous line (this is normal?), linebreaks within lists behave a bit different than regular Markdown
• this flavour currently lacks support of
  • definitions
  • multiline code within lists
  • footnotes
  • list types changing on nested ordered lists
  • syntax highlighting
  • emojis
  • forgiving indentation handling within lists, here you should be accurate; also lists don't accept blank lines without indentation regarding paragraphs
  • block sizes (lists, code, blockquote, etc.) longer than 8k characters may fail and impact further processing on php. you can split them though if applicable. this may be considered visually uncritical. ECMAScript is unaffected.

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due to the intended capability of turning scripts into links like [test](javascript:fn()) there may be the need to escape a bit more as in (this is an example: [test](javascript:fn())\)

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added definitions and footnotes c761152
fixed lists and multiline code 30e1819

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added list types changing in nested ordered lists, added references, general interpretation improvements (3898583 and 5b0f4e3)

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code is off in php, i have yet to figure out why. js works though.
code contents are prone to conversion of patterns as well.
underscore and other things may have to be escaped more often than in other flavors.

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fixed duplicate anchor processing, nested blocks in blockquote; escape underscore in links avoiding emphasis; improved consistent table and code rendering, latter without applying other methods 86ac36f