Allow alternative rendered text

[nima]

The point of this change is to allow a further configuration option where user can decide what the rendered text would look like. For example:

Where previously, the two following settings options would render into the third:

• pkg:([-\w]+), https://code.com.com/packages/$1 ⇨ pkg:$1

Now you can decide what the rendered text should look like, and what parts of that are active; i.e., three options (rather than two), the third defining both the full rendered text, and what part of it is clickable (between braces):

• pkg:([-\w]+), https://code.com.com/packages/$1, [CompanyCode:{$1}] ⇨ [CompanyCode:{$1}]
  • e.g., pkg:GoldenAxe ⇨ [CompanyCode:GoldenAxe]; bold here implies linked.

Additionally you can add emojis to the linked (or unlinked) rendered html element.

[nima]

I have to write more tests for this, I've discovered some edge cases that don't render correctly.