Implement new *content functions* feature (readme)

This commit implements a new feature called *content functions* that is
similar but much more powerful than the already existing *content tags*
which you may have already used (`{POST[1]}`, for example).

You now can also add your own *content functions* to do some interesting
things like embedding a YouTube video or other things to prevent typing
repetitive lines of text or code in your entities content.

Read the corresponding wiki page to learn more about this:
https://github.com/Nerdmind/Blog/wiki/Content-functions

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