added async http request and removed old sync impl #6
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Description
In order to make http requests non-blocking the previous synchronous calls are replaced with asynchronous ones. Additionally, the new implementation in the http.js script utilizes async-await syntax, which is easier to understand than the old XMLHttpRequest approach.
What does this PR do?
Fixes LimeChain#506
How were these changes implemented and what do they affect?
Changes have been made to the HttpRequest class and http.js script, which are called by the JsonUtil class. These modifications will not be visible to all users of the JsonUtil class.