Add microdata to breadcrumbs

[n9iels]

This PR add Micro Structured Data to the Joomla! breadcrumbs. I followed this guide lines: https://developers.google.com/structured-data/breadcrumbs

Also add some code style and change some if ($condition) { to if ($condition) : to make the code more readable.

Test instructions

Confirm that all parameters are working correct like they used do

[Fedik]

looks good,
but changing ul to ol can have side effect for people who use ul as selector in the breadcrumbs styling, I think better keep ul

and I do not see <meta property="position" content="<POSITION_NUM>">, that need for each item 😉

[n9iels]

@Fedik Thanks for noticing that :)

I add the <meta property="position" content="<POSITION_NUM>"> with help of the $key variable. But because it has to start with 1 instead of 0, I use $key + 1. I'm not sure if this is best way or not. Is there someone who think there is a better way to do this?

[Fedik]

thanks!
$key + 1 is fine 😉

[ghazal]

Test OK.
I am not very much into microdata, but the HTML generated looks allright.

[zero-24]

RTC Thanks 😄

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[peterlose]

Tested with Google's Structured data tester:

[Fedik]

hm, @peterlose on your test result still missed position

[n9iels]

Strange, my test results where good. Did you fetch the last data?

[peterlose]

Shoundn't position be itemprop as well? meta property is for RDFA

<meta itemprop="position" content="x" />

[Fedik]

@peterlose right, I just noticed this also 😄
@n9iels sorry, I gave you the wrong example, before

[n9iels]

Changed it, thx for testing

[Fedik]

@n9iels thanks, now is better 😉

[Kubik-Rubik]

Thank you @n9iels and testers. Merged with ab3de64