Fix for C++ 20

Version bump to 5.3

Merge pull request #11 from outoftheboxplugins/feature/offline-support

Feature/offline support

Merge pull request #10 from outoftheboxplugins/main

Show register pop-up if setup is not complete

Merge pull request #9 from outoftheboxplugins/main

Added headers for tracking requests

Merge pull request #8 from outoftheboxplugins/main

Prevent requests while API key is not present - resolves #5