Additional proxy fix and code-refactoring#29

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Hufschmidt wants to merge 7 commits intoDatabayAG:release_5_1_xfrom

Hufschmidt:mr/release_5_1_x/proxy

Commits on Oct 17, 2019

Source-code formatting cleanup
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Implement helper methods to get/post remote XML with proxy-support
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Use available ilAdobeConnectServer instance from ilAdobeConnectXMLAPI in ilSwitchAaiXMLAPI
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Initialize and use a single ilAdobeConnectServer in ilObjAdobeConnect
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Replace scattered curl_init() usage with centralized curl-handler from ilAdobeConnectServer
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Replace all simplexml_load_*, file_get_contents and custom-contexts calls with centralized getRemoteXML from ilAdobeConnectServer
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Drop system-wide proxy() configuration in ilAdobeConnectXMLAPI in favor of per-request context in ilAdobeConnectServer
Hufschmidt
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