Other changes include:
* AsyncTask: use a recursive mutex instead of atomics. Fixes build issues related to non-trivially-copyable elements.
* http: remove CURLOPT_ACCEPT_ENCODING option in httpPerformGetRequest().
* Added text files with required module information, which can be used with pip.
* Added a batch file to build a ZIP archive with a standalone copy of the script, which can be used to run it under Windows systems without Python.
* Further tweaked the way the progress bar window works.
* Debug messages are no longer printed to the log.
* Rearranged some parts of the code.
