Kijiji-manager

* Modify ad title before reposting to avoid duplicate ad detection
* Note that this is only a mitigation technique and it is not guaranteed to work 100% of the time; see _limitations_ section in the project README
* Thank you to adm-gis and QwertyCoolMT for contributing to the algorithm, and everyone else who contributed information in 62
* Update all package versions for Python 3.7
* Latest package versions still supporting Python 3.7

* Dump to file on XML parsing errors
* When an API response is not parsable as XML, write the problem text to a file to allow for further debugging

* App now supports reposting ads which were originally created on the main Kijiji site
* Previously if the app did not have a local ad payload file, it could not repost the ad because it did not know the ad contents. Now it will get the existing ad data from Kijiji and use that to repost the ad. When this is done it will also save an ad payload file locally in the users instance folder.
* Thank you to asyed03 for this feature
* Fixed bug in "repost all" ads button where it would fail if there was just a single ad to repost

* Handle when there are multiple API error messages and list each one to the user
* Fix Docker image to use Python 3.7 as a base - this was missed in the previous release
* Update some missed Python 3.6 references to 3.7 in the project README

* Drop support for Python 3.6
* App version number is now shown in the footer of each page
* Bugfix when manually posting an ad from an existing ad payload file

* Change ad image uploads from the eBay API (i.ebayimg.com) to Kijiji mobile API (media.kijiji.ca)
* A recent change in the Kijiji backend requires that all new ads use this new image host
* Older existing ads will automatically have their image URLs translated to use the new image API so that Kijiji will accept them
* Update all package versions for Python 3.6
* Latest package versions still supporting Python 3.6

This will be the last release still supporting Python 3.6 as it had reached end of life in December 2021.