Fixes some BBC and Markdown bugs

[Sesquipedalian]

• Fixes Some Markdown bugs #8360
  • Fixes issue where nested Markdown lists were parsed incorrectly
  • Go back to parsing smileys while parsing BBCode (fixes issue where smileys appeared inside code blocks)
  • Don't interrupt fenced code blocks when code is indented more than four spaces
  • Parses Markdown images correctly
• Smarter list item markers for nested Markdown lists
• Shows line breaks correctly in output from Parser::highlightPhpCode()
• Fixes a bug when a [code] BBC contained the literal string [code]
• Correctly parses Markdown emphasis wrapped around inline code, etc.
• Fixes some issues displaying tab characters
• Prevents overflow in code blocks in WYSIWYG editor mode

[live627]

Only remaining problem is images. Still see raw Markdown. Do I need to enable some setting? This fixes all other reported issues.

[Sesquipedalian]

Oops. I overlooked the images issues. Thanks for bringing it to my attention.

[Sesquipedalian]

Should now be fixed, @live627. Please confirm as soon as you are able. 🙂

[live627]

That fixed it. I'm mow looking at malformed BBCode from https://github.com/live627/smf-custom-forms/blob/master/src/install.txt

[Sesquipedalian]

That fixed it.

Excellent.

I'm mow looking at malformed BBCode from https://github.com/live627/smf-custom-forms/blob/master/src/install.txt

Let's deal with that as a distinct issue.