Fix the Escaping of the content of Code Blocks and Inline Code in Forum Posts, Crafts, and Comments (i.e. the Markdown processor)

When certain characters such as < and & and " appear in either inline code or multiline code blocks, instead of the character being displayed, the HTML entity is displayed. This usually means that what the user entered is being escaped twice when then should only be escaped once (because special characters do need to be escaped when they are present in HTML content). Here are some examples:

Inline examples: should be a less than: < should be an ampersand: & should be a quote "

Block examples:

should be a less than: <
should be an ampersand: &
should be a quote "