* added constant int value to --getversion for ease usage
* added condition to get env variable only if argument is not given for server url and api key
* added version info getter argument, corrected key stripping
* updated dockerfile and requirement file
* corrected import
* updated docker base & requirements
* fix: support 'utf-8 with bom' format
* fix: handle requests errors properly, add --wait option
* fix: use correct directory structure to work as python module