add ability to read JSON data

JSON is loaded and parsed. Then a XML document is created from it using the Array2XML class. The XML document is then processed as usual.

Includes the Array2XML class by Lalit Patel.
add showDebugInformation to default TypoScript configuration
add brackets for require_once
pass URL arguments to XSL as parameters

their names are

»argument-KEY1-KEY2-KEY3«

for »tx_xmlinclude[KEY1][KEY2][KEY3]«
add ability to work from an empty URL

Start with the XML document »<xmlinclude-root/>« in that case.
output as HTML
provide XML parsing as XSL function

Called as:

php:function('Tx_XMLInclude_Controller_XMLIncludeController::parseXML', string($xml-string))
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