Use # as prefix

[mariusGundersen]

Instead of json- as prefix it can use # as prefix, which will result in the attributes #each and #if, which is similar to mustache templates and also like c preprocessor directives.

[mariusGundersen]

• #if
• #else
• #else-if
• #unless
• #else-unless
• #each
• #with
• #key

[mariusGundersen]

This is a breaking change, so let's include some other breaking changes, like removing jsob-text (which is exactly the same as .text-content)